复制党退散木排顺河水漂流,木排通过码头时,一摩托艇正好经过码头向下游距码头s1=15km的村庄驶去,经过0.75h到达村

如果不是作业,而是兴趣,那我来说两句,大概就是原核基因的表达调控主要包括转录和翻译水平真核基因的表达调控主要包括染色质活化、转录、转录后加工、翻译、翻译后加工多个层次原核基因表达调控主要为负调控真核主要为正调控原核转录不需要转录因子,RNA聚合酶直接结合启动子,由sita因子决定基因表的的特异性真核基因转录起始需要基础特异两类转录因子依赖DNA-蛋白质、蛋白质-蛋白质相互作用调控转录激活原核基因表达调控主要采用操纵子模型转录出多顺反子RNA实现协调调节真核基因转录产物为单顺反子RNA功能相关蛋白的协调表达机制更为复杂.真核生物基因表达调控的环节主要在转录水平其次是翻译水平.原核生物基因以操纵子的形式存在.转录水平调控涉及到启动子、sita因子与RNA聚合酶结合、阻遏蛋白负调控、正调控蛋白、倒位蛋白、RNA聚合酶抑制物、衰减子等.翻译水平的调控涉及SD序列、mRNA的稳定性不稳定(5’端和3’端的发夹结构可保护不被酶水解mRNA的5’端与核糖体结合可明显提高稳定性)、翻译产物及小分子RNA的调控作用.

选择答案.第一个,决定生物性状的有外在的环境因素和生物体本身的遗传因素,而即使其遗传物质发生改变,也不一定会表现在性状的改变,因为多个碱基才能控制一个氨基酸的合成,而不同的氨基酸却也能控制相同蛋白质的合成,.总之,最终表现在性状上就是很不确定的事了,二是边解旋边复制,是同时进行的,第三个,第四个都对 所以选择B

我有以下几条供参考：（有300/400/500/700字的）
建议书
罪恶的人类：
如今十分发达的地球,虽然环境情况看起来十分乐观,但是却有十分重大的隐患,这都是人为制造出来的,：大肆砍伐树木、建立化工厂、胡乱排放有害液体.“对人类威胁较大的气体,世界每年的排放量达6亿多吨……；估计到下个世纪中叶,地球表面有三分之一的土地面临沙漠化的危险,每年有6平方公里的土地沙漠化,威胁着60多个国家……”看见这一组组令人触目惊心的数字,人类,你们有何感想?从2300万年到1800万年前森林古猿的出现到现在人类高度发达的文明时代,对于每个人从未停止过的索取,大自然都是“有求必应”的,这更滋长了人类的贪欲.
举一个例子：我国的木兰溪,在50年代初本是一个清澈见底的河流,但现在它已是鱼虾绝迹的污河,又为我们的地球母亲添多一道疤痕.这,不是给人类重重地敲响了警钟吗?
由此,我郑重地向仍未觉悟的人们建议：
第一,人类要想征服可怕的大自然,就必须尊重自然.对于改造自然理应慎之又慎,又要大刀阔斧,勇于实践和改良,才能控制自然,使自身利益与自然协调发展,决不能重蹈西方发达国家“先污染,后治理”的覆辙.
第二,要从我做起,首先选择有利于保护环境的生活方式.善待我们的家园、善待地球,共创一个美好的生活环境.
1、节约资源 减少污染
（1）节水为荣,随时关上水龙头,防止滴漏.
（2）慎用清洁剂,尽量用肥皂,减少洗涤剂中的化学物质对水的污染.
2、绿色消费 环保选择
（1）用无铅汽油、无镉铅电池、无磷洗涤剂,减少水与空气的污染.
（2）购买低砩家用制冷器具、无砩发用摩丝,减少对臭氧层的污染.
3、重复使用 多次利用
尽量少使用一次性用品,多使用耐用品.如不使用一次性塑料和餐盒,减少白色污染；不使用一次性筷子；自备购物口袋或提篮.
4、分类回收 循环再用
不乱丢弃废电池、废塑料等垃圾、废物；将垃圾分类投放,变废为宝,使资源循环再生,造福人类.
5、保护自然 万物共存
不猎杀、使用珍稀动物和受保护的动物,关爱与保护野生动植物；植树造林,爱护我们身边的每一寸绿地、每一株花草、每一片树木.
6、讲究卫生 保护环境
不随地吐痰,不乱扔垃圾,不在公共场所吸烟,不制造噪音.
作为新时代的小学生,我倡导同学门提高保护环境的意识,也建议叔叔阿姨们加入我们的队伍中来,为保护环境、造福后代贡献自己的力量.因为：保护环境,刻不容缓!
保护地球,从我做起
古往今来,地球妈妈用甘甜的乳汁哺育了无数代子孙.原来的她被小辈们装饰得楚楚动人.可是,现在人类为了自身的利益,将她折磨得天昏地暗.人类只有一个地球；而地球正面临着严峻的环境危机.“救救地球”已成为世界各国人民最强烈的呼声.
我为周围环境的恶化而感到心痛,我想：作为未来接班人的青少年,如果不了解人类环境的构成和环境问题的严重性,无视有关环境保护的法律法规,不去增强环境保护意识,自觉履行保护环境的义务的话,我们的生命将毁在自己的手中,老天将对我们作出严厉的惩罚.为此我下定决心要从我做起爱护环境,保护我们这个赖以生存的家园,做一个保护环境的卫士.
在刚过去的一年中,我积极参加学校开展的植树活动,带领我们初一(6)中队的班干部创立了“绿色天使”植绿护绿小组,鼓励队员们在校园里认养了一棵小树苗,利用课余时间给它梳妆打扮,为它长成参天大树打下了基础.在学校组织的“让地球充满生机”的签字活动中,我郑重地在上面签下自己的名字,并写下了自己对环保的决心和期望,对美好未来的憧憬.我积极参加学校在世界环境日举行的有奖征稿,认真查阅、收集各类资料,进行社会调查,撰写有关环境治理设想方面的文章,我经常去参加学校组织的环保讲座,观看环保方面的录相带,积极参预环保知识问答调查活动,认真填写每一项提问.我参与了“红领巾植绿护绿队”的网站建设,在上面发布大量的环保图片和环保知识,以及关于环保的各方面的法律知识,我国在环保方面发展动向、世界各国的环境保护情况；每个月我都利用网络、报纸,查找一些最新的不同的专题和板块“环保资讯”来告诉大家；还定期制作一些宣传板来宣传环保知识和生活中的环保常识.提高了大家的环保意识；号召同学们从不同的方面来关爱自己的家园,从身边的小事做起,为周围的环境奉献自己的一份力量!我积极动员身边的人一起来依法保护和建设人类共有的同样也是仅有的家园,为促进经济和社会的可持续发展,为人类的文明做出贡献.我还和同学们共同发起“养一盆花,认养一棵树、爱惜每一片绿地,让我们周围充满绿色”和“小用塑料袋不使用泡沫饭盒和一次性筷子,让我们远离白色污染”的倡议.让我们放下方便袋,拿起菜篮子,让我们共同走向美好的绿色的明天,走向辉煌、灿烂的未来!
据我收集到的一份报告说：“环境问题是由于人类不合理地开发和利用自然源所造成的.触目惊心的环境问题主要有大气污染、水质污染、噪声污染、食品污染、不适当开发利用自然资源这五大类.”一个个铁一样的事实告诉我们,它们像恶魔般无情地吞噬着人类的生命.它威胁着生态平衡,危害着人体健康,制约着经济和社会的可持续发展,它让人类陷入了困境.为此我作出宣告：“只要我们——人类有时刻不忘保护环境的意识,有依法治理环境的意识,地球村将成为美好的乐园”.未来的天空一定是碧蓝的,水是清澈的,绿树成荫鲜花遍地,人类可以尽情享受大自然赋予我们的幸福.
“真正检验我们对环境的贡献不是言辞,而是行动.”虽然我现在做得只不过是一些微小的事,但是我坚信要是我们人人都有保护环境的责任心,从自己做起,从小事做起,携手保护我们的家园,自然会给人类应有的回报.在温暖的摇篮——草原上小憩；在慈祥的笑脸——天空下成长,在爱的源泉——河流中沐浴.
居委会的叔叔阿姨们您们好：
地球让我们生存,让我们保护.地球是我们的家园,我们是地球的小主人.谁不想让我们的家园变的更美好,更漂亮?而在这个时候,那些卖水果、小吃、蔬菜的叔叔阿姨们,在各个地方摆摊而等到晚上就收摊走人,可他们却没有看到在他们周围到处都是他们丢弃的垃圾,等到再过几天,那些垃圾在地上发臭,苍蝇、蚊子都飞来飞去,让过路的行人都得捂着鼻子,快步走过去.你们有没有想过,就是你们这样乱丢垃圾,给我们的美丽家园添了点脏.所以,我希望居委会的叔叔阿姨们,让那些摆小摊的小贩在走时带走自己的垃圾,让他们学会爱护好我们美好的家园,在此,我提出几点建议供你们参考：
1、请行人自觉爱护公园、路边及其他公共场所的花草树木.
2、照顾好自己身边的一草一木、爱护花草.
3、希望社会上多增加一些植树、种花草的活动,希望大家积极
参加.
住在地球上的每一个公民,让我们共同努力,以使我们的地球更美丽、可爱,使我们生活的环境更美好,人人争做地球的小卫士.
亲爱的同学们：
环境保护是指人类为解决现实的或潜在的环境问题,协调人类与环境的关系,保障经济社会的持续发展而采取的各种行动的总称.
我国把环境保护宣布为我国的一项基本国策.所以我们要努力做好环境保护.然而,现在有许多不好的现象,例如：许多人在街上随地扔垃圾,吐痰.汽车的尾气超标,等等.为了保护环境,保护我们的家园,我提出如下建议：
1、实行垃圾分类化.这样不仅能减少环卫工人的工作量,还能更好地起到废物利用,减少污染.
2、节约资源.建议大人买菜时,少用塑料袋,尽量用竹篮子.用笔尽量用可换芯的,减少圆珠笔外壳的浪费与垃圾量.
3、外出吃饭尽量不用一次性饭盒.绿色消费,尽量少使用一次性用品,多使用耐用品.
4、人类要想征服可怕的大自然,就必须尊重自然,爱护树木,爱护动物,爱护大自然的一切.
5、要从我做起,首先选择有利于保护环境的生活方式.善待我们的家园、善待地球,共创一个美好的生活环境.
环保是现代生活中人类面临的最大问题.要解决这一问题必须从现在做起,为了地球的明天,我们必须要从自己开始努力,好好地保护环境!
环保建议书
尊敬的深圳市环保局领导：
你们好!我是深圳市南山实验学校六年级的一名学生.
如今十分发达的地球,但是却有十分重大的隐患,这都是人为制造出来的：大肆砍伐树木、建立化工厂、胡乱排放有害液体.“对人类威胁较大的气体,世界每年的排放量达6亿多吨……”看见这一组组令人触目惊心的数字,真是叫人吃惊何感想?从2300万年到1800万年前森林古猿的出现到现在人类高度发达的文明时代,对于每个人从未停止过的索取,大自然都是“有求必应”的,这更滋长了人类的贪欲.
环保局的各位领导,以下是我为这个美丽的城市所提出来的建议,供你们参考!
第一,我们要做到讲究卫生,因为那样才能够保护环境!当然就是不能随地吐痰,不乱扔垃圾,不在公共场所吸烟,不制造噪音.
第二,我们要保护自然环境,那样万物才能共同生存在一个美好的家园.我们不但自己要做到,而且还得以自己的力量来提倡身边的人不猎杀、不使用珍稀动物和受保护的动物,关爱与保护野生动植物；植树造林,爱护我们身边的每一寸绿地、每一株花草、每一片树木!现在我们部分地方已经做起了这个活动项目：“分类回收 循环再用”. 我们不能乱丢弃废电池、废塑料等垃圾、废物；而是要将垃圾分类投放,变废为宝,使资源循环再生,造福人类!
第三,我们一定要做到最重要的一个：节约资源 减少污染!节水为荣,随时关上水龙头,千万不能浪费我们的水资源!
以上就是我为这个美丽的城市所提出来的建议,希望环保局的领导能参考参考我的建议.
希望我们的城市能越来越美丽!

染色质和染色体是一个东西,具体是以什么形式出现不知道,核膜不消失,有核膜包着,估计是染色质,无私分裂的概念就是没有纺锤体的特殊真核生物的分裂方式,特征就是无纺锤丝和染色体的出现,你可以认为不缩聚,但要注意,染色体一定要复制的

这个句子无虚拟语气.suggest doing表示建议做某事,所以用stopping.should是情态动词,直接加动词原型.who had been driving all day是从句,剩下是主句.手机登的没法写了关于虚拟语气你Hi我吧

Dear editor,
I have been a faithful reader of your newspapers for many years.I want you to have my opinion on setting off the fireworks.
It is our tradition to set off the fireworks in the Spring Festival.As we know,it is used to creating a happy atmosphere.People express their whises for welcoming the new year,blessings and fortunes.I had seen some accidents in my eyes.For example,causing fire,hurt eyes or ears.
As far as I am concerned,we should be more careful while we set off the fireworks.Children should companied by adults.We should be happy,and safe as well.
Thank you for reading my letter!
Sincerely,
Wu Ming

what will life be like without animals?
With the improvement of our life,we become more and more comfortable.But have you heard a sound"Help,help",which comes from the rare animals.
As we know,animals are the closest friends of us human beings,especially the rare animals.It is their existance that makes our world colourful and meaningful.So the rare animals are of great value.Not only can't we damage them,but also we should spare no efforts to pretect them.However,I have heard that even some rare animals in the zoo are damaged by people recently,which disappointed me very much.The rare animals are suffering from horror and danger.The reason is that some people are poor in the knowledge of protecting animals and they also don't care about animals at all.Obviously,if we continue to do so,the rare animaals will die out.As a result,we human beings can't live any longer without them.
We ought to remember that it's everyone's duty to protect rare animals.For the benefit of rare animals and ourself.We must learn and publicize the importance of protecting them.Meanwhile,we should take useful measures to keep them from being damaged.
Listen to the sounds of the rare animals by heart,and make our life harmonious.

Dear teacher,
How are you?I am very well here.I miss you very much.
In my eyes ,you are the best teacher I have ever met .You are a very good math teacher.I still remember clearly that you taught us to learn maths.You always showed various ways to help us to solve the same math problem.Every time in the class you always taught us patiently just like our mother.Outside the class ,as our class teacher,you took good care of us.With your help,many students in our class have made great progress.
Thank you my dear teacher ,I don't know how to express my love to you.Thank you my dear teacher,you are the candle in my life lighting my future.Thank you my dear teacher,you are the spring watering us.Thank you my dear teacher,you are the sun warming us.You show all teachers' noble characters.
I am proud of that you have brought up many excellent students.
Do trust me.I will do my best in my study to make myself as a useful person for our country.
简单,

52．(6×108)(7×109)(4×104)．
53．(-5xn+1y)•(-2x)．
54．(-3ab)•(-a2c)•6ab2．
55．(-4a)•(2a2+3a-1)．
58．(3m-n)(m-2n)．
59．(x+2y)(5a+3b)．
60．(-ab)3•(-a2b)•(-a2b4c)2．
61．[(-a)2m]3•a3m+[(-a)5m]2．
62．xn+1(xn-xn-1+x)．
63．(x+y)(x2-xy+y2)．
65．5x(x2+2x+1)-(2x+3)(x-5)．
67．(2x-3)(x+4)．
70．(-2ambn)(-a2bn)(-3ab2)．
74．(m-n)(m5+m4n+m3n2+m2n3+mn4+n5)．
75．(2a2-1)(a-4)(a2+3)(2a-5)．
76．2[(x+2)(x+1)-3]+(x-1)(x-2)-3x(x+3)．
77．(0.3a3b4)2•(-0.2a4b3)3．
78．(-4xy3)•(-xy)+(-3xy2)2．
80．(5a3+2a-a2-3)(2-a+4a2)．
81．(3x4-2x2+x-3)(4x3-x2+5)．
83．(3am+2bn+2)(2am+2am-2bn-2+3bn)．
86．[(-a2b)3]3•(-ab2)．
87．(-2ab2)3•(3a2b-2ab-4b2)．
91．(-2xmyn)3•(-x2yn)•(-3xy2)2．
92．(0.2a-1.5b+1)(0.4a-4b-0.5)．
93．-8(a-b)3•3(b-a)．
94．(x+3y+4)(2x-y)．
96．y[y-3(x-z)]+y[3z-(y-3x)]．
52．(6×108)(7×109)(4×104)．
53．(-5xn+1y)•(-2x)．
54．(-3ab)•(-a2c)•6ab2．
55．(-4a)•(2a2+3a-1)．
58．(3m-n)(m-2n)．
59．(x+2y)(5a+3b)．
60．(-ab)3•(-a2b)•(-a2b4c)2．
61．[(-a)2m]3•a3m+[(-a)5m]2．
62．xn+1(xn-xn-1+x)．
63．(x+y)(x2-xy+y2)．
65．5x(x2+2x+1)-(2x+3)(x-5)．
67．(2x-3)(x+4)．
70．(-2ambn)(-a2bn)(-3ab2)．
74．(m-n)(m5+m4n+m3n2+m2n3+mn4+n5)．
75．(2a2-1)(a-4)(a2+3)(2a-5)．
76．2[(x+2)(x+1)-3]+(x-1)(x-2)-3x(x+3)．
77．(0.3a3b4)2•(-0.2a4b3)3．
78．(-4xy3)•(-xy)+(-3xy2)2．
80．(5a3+2a-a2-3)(2-a+4a2)．
81．(3x4-2x2+x-3)(4x3-x2+5)．
83．(3am+2bn+2)(2am+2am-2bn-2+3bn)．
86．[(-a2b)3]3•(-ab2)．
87．(-2ab2)3•(3a2b-2ab-4b2)．
91．(-2xmyn)3•(-x2yn)•(-3xy2)2．
92．(0.2a-1.5b+1)(0.4a-4b-0.5)．
93．-8(a-b)3•3(b-a)．
94．(x+3y+4)(2x-y)．
96．y[y-3(x-z)]+y[3z-(y-3x)]．
97．计算[(-a)2m]3•a3m+[(-a)3m]3(m为自然数)．
1,(m+2)(m2+4)(m+2)
=(m+2) (m+2) (m2+4)
=( m2+4m+4) (m2+4)
=(m2+4) (m2+4)+4m(m2+4)
=m4+8m+16+4m3+16m
2,20022-2001*2003
=(2001+1)(2003-1)-2001*2003
=2001*2003+2001+2003+1-2001*2003
=2001+2003+1
3,(x-5)(x+5)-(x+1)(x+5)
=x2-25-(x2+6x+5)
=-6x-30
4,(-a+2b的平方)-(a+2b)(2b-a)
=(2b-a) (2b-a)-(2b+a)(2b-a)
=4b2-4ab+a2-4b2+a2
=2 a2-4a

提供你一个方法。
循环小数都能转换成分数，你可以将循环小数转换成分数后再计算。
以你给的题目为例：
1.0 +2.1 +3.2 +4.3 +5.4 +…+9.8
=1+2+3+4+5+..+9+0.0+0.1+0.2+0.3+..+0.8
=45+0+1/9+2/9+3/9+...+8/9
=45+（1+2+3+..+8）/9
=45+4

e doing相当于 will do
例如：I am going to Beijing tomorrow.
I will go to Beijing tomorrow.
翻译：我明天要去北京.

NO LOST THEMSELVES 〓

...but I don't think I'm quite ready with that.
The fact is that I'm afraid of speaking English during lessons. That's probably because I'm afraid of making stupid mistakes and get laughed at by everyone. And during role plays and parties related to speaking English, again I'm worried about my English level. When I meet foreigners, my fear is at its most. How hard it is to speak a word in English, when I'm so concerned about some mistakes being made fun of by them!
I would say, the crucial point of this whole English phobia is that I'm afraid of making mistakes.
I will appreciate that if I can be pointed to some sort of a direction by you people.
Yours,
Ann

分给我吧 手都打酸了.
书：乃丹书帛曰（写）好像只有一个啊.
之：错耕之陇上（去,往）
怅恨久之（不译）燕雀安知鸿鹄之志哉（的）
二世杀之（他,指扶苏）楚人怜之（指项燕）
又间令吴广之次所旁丛祠中（去,到）杀之以应陈涉（指各地郡县长官.）
为：为屯长（当任）为天下唱（向）士卒多为用者（被）为坛而盟（筑）号为张楚（是）
而：夺而杀尉（不译?）收而攻其（不译?）
乃：乘胜,吴广乃谋曰（就）当立者乃公子扶苏（是）乃行卜（就）乃令符离人葛樱将兵徇蕲以东.（就?）
亡：今亡亦死（逃跑）死国可乎（为……而死）
行：乘胜,吴广皆次当行（队伍）行收兵（行军）
应：佣者笑而应曰（回答）杀之以应陈设（相应）
兵：上使外将兵（士兵）乃令符离人葛樱将兵徇蕲以东.（士兵）
.没了

脱式计算.
408－12×24 （46＋28）×60 42×50－1715÷5
32＋105÷5 （108＋47）×52 420×（327－238）
(4121+2389)÷7 671×15-974 469×12+1492
405×(3213-3189) 5000-56×23 125×(97-81)
6942+480÷3 304×32-154 20+80÷4-20＝
100÷（32-30）×0＝ 25×4-12×5＝

70×〔（42-42）÷18〕＝ 75×65+75×35＝
用简便方法计算下面各题
1、89+124+11+26+48 2、875-147-23
3．25×125×40×8 4、147×8+8×53
5、125×64 6、0.9＋1.08＋0.92＋0.1
用简便方法计算
①89+124+11+26+48 ②875-147-23

③147×8+8×53 ④125×64
计算下面各题．
1．280＋840÷24×5 2．85×(95－1440÷24)
3．58870÷(105＋20×2) 4．80400－(4300＋870÷15)
5．1437×27＋27×563 6．81432÷(13×52＋78)
7．125×(33－1) 8．37.4－(8.6＋7.24－6.6)
计算.（1∶1）
（1）156×107-7729 （2）37.85-（7.85+6.4）
（3）287×5+96990÷318 （4）1554÷[（72-58）×3]
脱式计算
2800÷ 100＋789 （947－599）＋76×64
1．36×(913－276÷23) 2．(93＋25×21)×9
3．507÷13×63＋498 4．723－(521＋504)÷25
5．384÷12＋23×371 6．(39－21)×(396÷6)
（1）156×[(17.7-7.2)÷3] （2）[37.85-（7.85+6.4）] ×30

（3）28×(5+969.9÷318) （4）81÷[（72-54）×9]
57×12－560÷35 848－640÷16×12

960÷（1500－32×45） [192－（54＋38）]×67
138×25×4 (13×125)×(3×8) (12+24+80)×50 704×25 25×32×125 32×(25+125)
178×101－178 84×36+64×84 75×99+2×75 83×102－83×2 98×199
123×18－123×3+85×123 50×(34×4)×3 25×（24+16） 178×99+178
79×42+79+79×57 7300÷25÷4 8100÷4÷75 75×27+19×2 5 31×870+13×310
4×(25×65+25×28) 138×25×4 (13×125)×(3×8) (12+24+80)×50
25×32×125 32×(25+125) 102×76 58×98
178×101－178 84×36+64×84 75×99+2×75 83×102－83×2
98×199 123×18－123×3+85×123 50×(34×4)×3 25×（24+16）
178×99+178 79×42+79+79×57 7300÷25÷4 8100÷4÷75

刚开始有一个,复制一次双链打开变成两个,当然每条链上还是有二条单链,这样复制第二次变成4个,三次8个,复制n次后有2的n次当个,然后开始的那一个不需要核苷酸,所以总共是2的n次方-1个,第n-1次共有2的n-1次方个再减一,那么在这个基础上复制一次也就是第n次,需要的还是2的n-1次方再减去一,因为复制一次,就会变成2倍的第n-1的个数,可是新增的要去掉第n-1次原有的,所以第n次是2的n-1次方再减去1.应该可以看懂吧.

解题思路：此题综合考查了生物的基础知识．如细胞的分裂过程、体细胞的特点、染色体的组成等知识．

A、细胞分裂中最重要的变化是细胞核中染色体的变化，在细胞分裂前，染色体会进行复制，随着分裂的进行，染色体分成形态和数目相同的两份，分别进入两个新细胞中．故A正确；
B、细胞能够从周围环境中吸收营养物质而生长，但不能无限制地长大．故B错误；
C、不同种生物细胞内的染色体的数目是不同的，同种生物细胞内的染色体的数目是相同的．故C说法是错误的．
D、细胞核内能被碱性染料染成深色的物质称做染色体，它是由DNA和蛋白质组成的．故D说法是错误的．
故选：A．

点评：
本题考点： 细胞分裂的基本过程；染色体、DNA和基因的关系．

考点点评： 解此题的关键是理解掌握生物的基础知识．

曲率不处处为零的空间称为弯曲空间.初等平面几何所研究的对象是欧几里得空间（欧氏空间）.这种几何的最重要性质之一就是平行线公设：通过给定直线之外的任一点,可作一条直线与给定直线平行.这个公设在弯曲空间中并不...

　　幸福的味道
　　幸福,是天空里自在飘浮的云朵,如若不知珍惜,定会在不经意的时候悄悄溜走.
　　生活在这个平凡的世界,从前我总想知道幸福是什么样子.词典中说,幸福,就是使人心情舒畅的境遇和生活.抽象的释意,一下子让我想起以前曾在少年宫看到过的一幅多维”幸福”的画.
　　那幅画是出自一个六岁孩子的手,只用了一些单调的线条,却勾勒出一个最幸福的画面.图画的内容很简单,是说一个父亲抱着孩子,挽着妻子在公园里游玩．
　　一个平凡的画面,在孩子的心中,这就是最幸福的时刻.温暖的阳光晒出一家人的和睦,不时划过的风嫩绿着无暇的童年.而此刻,幸福如呈现在眼前的画面,让人不知不觉中尝到了甜甜的风的味道,软软的阳光的味道,温温的父母微笑的味道,和自己肆意快乐的味道.我知道这都是幸福的味道,简简单单,不参一丝杂质.
　　有些人,一生都在寻找他们心中的那些所谓的”幸福”,却终究一无所获,其实,他们并不知道幸福如小猫的尾巴,只要你在,它一直在你身后.他们不懂得,走的太快,便忽略了路边风景；要得太多,便失去了宝贵的心情.珍惜身边的幸福,不要等幸福的云朵飘过头顶,才后悔当初没有珍惜那淡淡的却令人回味的味道.
　　幸福其实很简单,看着升起的太阳投向人间的光明,证明我们还活着；听着小鸟的歌唱在心中荡起的回响,证明我们还能听见；闻着花草的清香,证明我们的鼻子还没失灵；感受着亲人的爱,证明我们正在幸福着……幸福就是这么简单,无须那么抽象的理解,我们也可以轻松地感觉到幸福的存在.幸福的味道无须很浓烈,只是轻柔的绕与鼻尖,却带给我们无穷的回味与享受,在这品味中我们抓住了幸福.你说幸福是什么味道?

物质和能量是等价的,物质是由基本粒子组成的,基本粒子本身是能量的聚合.在一定条件下粒子可以完全转变为能量,如正负电子湮灭,而来时粒子无时无该不在释放能量.
绝对时空观认为空间是容纳物质的载体,相对时空观认为空间就是物质与物质之间的距离.相对论属于后者.
按些种理论,空间是由物质构成的,打个比方：空间中只有一个球,这个球变大时,宇宙空间就相应变大,整个球的密度同时会下降.这个球的外表面所能到达的位置就是空间的边界.

有丝分裂发生在间期
减数分裂发生在第一次减数分裂的间期

由于半保留复制,错误的链合成的子链都是错的,所以选B

In the morning,I wanted to sleep till eight o`clock, but my grandpa woke me up and brought me to the swimming poor.So, I had to swim with him.Although I know that swimming is good for people ,I think the water is too cold.and I want to stay at home.Today is so hot that I cannot stay outside!A friend of my daddy came this morning and my papa gave me some money to get some drinks for the meal with his friend.For the change would be mine ,I went.But when I got out ,I found it was too hot to stand.My older brother is a good student ,fifteen years old. He is good at English very much. He came a week ago because my anut and uncle had left for special visit for London.And now he is helping me write this diary.People always say Luxun is a great writer. Today I read a work called wind wave. But , I don`t think so, I don`t like him ,because his work is too hard to read for me.Maybe he is great in people`s eyes but I just dislike his work.I had a bad dream last night.I dreamed I was playing on the beach and a tornado hit there.And many people died. I was scared and ran away quickly. That was too awful!Then I woke up in the night and found myself rollde down from the bed .先就给你这几篇吧……很久没有用初一水平写英文了……其实编得很怪,写得也很怪~~记得采纳啊,采纳的话我再写个10篇哦!绝对守信用.

stare :盯着 glare :怒视
You can stare at me but you can't glare at me .

Send one's pray to sb

2÷﹙2＋3﹚＝2/5
30÷﹙2/5－1/4﹚＝200页.

我开始每个星期都学习钢琴了.

yes,I do,这是一个删减句,补全后应该是,yes,I have a brother.也就是说把have a brother这个动词词组缩写成do这一个词了,否定句也是同理.

3/2a^2b与a-b/ab^2c
3/2a^2b=3c/(2a²bc)
a-b/ab^2c=(2a-2b)/(2a²bc)

我也要复议!我也不能接受!我也是那一天的. 同学我q 396451598

文言文阅读现在中高考难度都不大,我是刚经历了高考才敢这么说,速度很重要.不要逐字逐句,通读文意才是制胜之道,字词意思很多,但是明白了它要表达的内容了就不难得出词意了.本人平时几乎不读语文,但文言这题败不了,就是用这招,希望对你有所帮助.

那是G4*I4,则 G4*I4=56X1680=94080就是G4单元格的数值56乘以I4单元格的数值1680,最终得到94080,中间的星号 * 在EXCEL中代表乘号.
其余部份拖动就是公式下拉或右拉的意思,在这例中,公式是下拉：公式下拉方法：选中要下拉的单元格,鼠标移到该单元格右下方,鼠标指针变为黑色的实心加号 + ,然后按住左键不放,向下拉即可.
J4输入公式,然后向下拉动：=G4*I4
单元格的命名规则：在上方那A、B、C、D的一横排英文字母代表列,在最左边1、2、3、4、的那一竖排代表行,单元格的命名就是 列+行 的方式,即先写列再写行,如G4就是G列的第4行那个单元格,I4就是I4第4行了,以此类推.

每个最高级前都要加the,有的只是要不要加most 比如：the biggest bag最大的包 the most important book 最重要的书

COLUMN 语法
COLUMN(reference)
Reference 为需要得到其列标的单元格或单元格区域.
如果省略 reference,则假定为是对函数 COLUMN 所在单元格的引用.
如果 reference 为一个单元格区域,并且函数 COLUMN 作为水平数组输入,则函数 COLUMN 将 reference 中的列标以水平数组的形式返回.
Reference 不能引用多个区域.
以上是微软 官方的解释
以下我说下个人的理解
其实这只是一个很简单的 查找函数, 和ROW 是 一个相互对应的函数
正常语法
1： =COLUMN() 返回你输入单元格列数的值,如在D列输入 返回 4
2： =COLUMN(A1) 返回1 =COLUMN(B1) 返回2
3： 组合函数应用 =CHAR(COLUMN()+64) 你在A1 单元格输入上公式后得到A
然后右拉 依次得到 B C D ···
同理将以上的 COLUMN 换成 ROW 就变成了行数了,往下填充试下就知道了

我认为 原句有问题
应该是He put up a notice,which read:"I will meet her class tomorroww."
或He put up a notice,reading:"I will meet her class tomorroww."
前者是非限制性定语从句
后者是现在分词作非限制性定语

生化书里说的 “每个细胞只有一个或少数几个拷贝”是指的：在同一个细胞内有几个完全相同质粒同时存在的数量,而不是复制多少次.
我想你输错了,松弛控制的质粒,每个细胞可以有几十直到几百个拷贝,也就是说,同一个细胞内,有完全相同的质粒几十直到几百个.现在基因工程里常用的大肠杆菌质粒如pUC19等就属于这一类.
严谨型的质粒,才只有一个或少数几个拷,比如大肠杆菌的F质粒,在人类基因组中用得很多的BAC质粒就属于这一类质粒.
严谨型的质粒的复制,受基因组的复制的调控.而松弛型的质粒不受其调控,也就是在细胞不分裂时,松驰型的质粒还会继续复制,而严谨型的则一般会停止.
在适当的宿主细胞内,质粒总是会随着细胞一直不停的复制下去的,所以质粒的复制能力是无限的,因此,生化书里说的是指的在一个细胞内有几个拷贝数,而不是复制多少次.

《冰河世纪》的：
CGI fun for all
This is obviously aimed at the same market as Monsters Inc and Shrek,but is different in its less cartoony feel (despite the deliberately cartoony characteristics of the lead creatures).The story is not one that had a massive in your face moral at the end (its more like its tugging at your shirt sleeves) but chooses just to tell a story about relationships between different "animals." You know the outcome,but you can't help being drawn in.
The characters themselves are far more than their voices (the advantage of less famous actors doing the voices),unlike most Disney movies.They are well rounded and completely believable,strangely.The group dynamics are brilliantly well presented and the character revelations and quirks are subtle and enjoyable.You will find yourself rooting for them far sooner than you would like to think.
The animation is brilliant,as you would expect,and you will be praying for the opportunity to go on the ice slide in the movie.You will fall in love with the characters,especially the comic relief of the prehistoric squirrel and its desperate attempts to bury its nuts.I came out wanting the obligatory merchandise,especially the sloth toy,only to be disappointed the next day when I couldn't find anything vaguely related.
Which,strangely,makes the movie all the more pure.
Better than Monsters Inc or Shrek.
再来篇《怪物史莱克》的吧：
A Wonderful Achievement
Shrek is a wonderful parody of every fairytale story that you can think of,for the kids it has charm,humour and tons of fun,and is a delightful film for them to enjoy.In addition,Shrek has plenty of subtle innuendo and more adult themes running seamlessly along side the story,much of which may pass younger children by,without spoiling any element of their enjoyment; while at the same time enhancing the enjoyment for the older viewers.
Shrek is simply so well created that it can successfully appeal to a huge audience excellently voiced as it is,by Mike Myers,John Lithgow,Cameron Diaz and Eddie Murphy.
Brilliant characters,solid script and hilarious parody,make this film a simply wonderful achievement,and that's without mentioning the awesome computer generated world that houses it.

因为有一百个碱基“对”,故有二百个碱基,因为A有六十个,故T有六十个,故C和G有八十个,故C有四十个.复制两次,产生四个DNA,有三DNA个是复制后产生的,一个是本来的那个,故40乘3=120

用数学归纳法.
如：当n=2时
范德蒙德行列式D2=x2-x1范德蒙德行列式成立
现假设范德蒙德行列式对n-1阶也成立,对于n阶有:
首先要把Dn降阶,从第n行起用后一行减去前一行的x1倍,然后按第一行进行展开,就有Dn=(x2-x1)(x3-x1)...(xn-x1)Dn-1于是就有Dn=||(xi-xj)(其中||表示连乘,i,j的取值为m>=i>j>=2),原命题得证.

“入团志愿书”部分分三段.长度应至少达到整页的三分之二.
　　内容如下：
　　第一段：与写信不同,没有称呼.由第一行直接写第一段,统一以“我志愿加入中国共产主义青年团”开头.然后写对共青团组织的认识,参考《团章》“总则”部分.
　　第二段：写自己的简历（学习生活情况）和入团动机（目的）.
　　第三段：表明态度.以“如果团组织认为我还达不到要求,我将决不气馁；如果团组织批准我的申请,我也将继续努力.”或类似的话结束.
　　落款：位置和写信类似,直接写自己的姓名、申请的年月日.

5.7.26-(5.26-1.5) 6.286+198 7.314-202 8.526+301 9.223-99 10.6.25+3.85-2.125+3.875 11.9-2456*21 12.0.5/11.5-4*2.75 13.1/2×3/5 14.3.375+5.75+2.25+6.625 15.1001－9036÷18 16.3.8×5.25+14.5 17.2.1*4.3+5....

一个单元格的定位用横向行所在行号与列所在列号来定位,在引用单元格时,一般为相对引用,即引用单格格公式位置变化时被引用单元格也会变化,如：在B1单元格中录入=A1,B1为引用单格元格,A1为被引用单元格,将B1公式复制到C1,公式变成＝B1,说明被引用单元格变成了B1
而符号“$”表示绝对引用,即表明在引用单元格的行或列号变动时,被引用单元格的行或列号不变,“$”应放在行所在的行号或列所在的列号前,分别表明行号不变或列号不变
在你的公式中$A1表示,列号为绝对引用,即不管引用单元格位置在哪儿都只引用A列数据
而B$1表明,行号为固定的第1行,不管引用单元格位置在哪儿都只引用第1行数据.

（1）当n≥2时,
Sn=-an-(1/2)^n-1+2,
S(n+1)=-a(n+1)-(1/2)^n+2
∴a(n+1)=-a(n+1)+an+(1/2)^n,
∴2a(n+1)=an+(1/2)^n,
∴2^(n+1)a(n+1)=2n•an+1
∴b(n+1)-bn=1（n≥2）,
又∵b2-b1=2^2•2×a1=1
∴b(n+1)-bn=1（n∈N+）
∴{bn}为等差数列
∴ b1=2×a1=1,bn=1+(n-1)=n,an=n/2^n
思路：从Sn入手,变形成an的关系式,然后再转化为bn的关系式.这一问应该难不倒你,很基础.
（2）设数列{an}的前n项和为Sn
知|a（n+1）-an|+|an-a（n-1）|+…+|a2-a1|
= [（n-1）/2^（n+1）]+ [（n-2）/2^n]+…+ 0/2^2
=S（n-1）/4
∵Sn=n/2^n+[（n-1）/2^（n-1）]+ [（n-2）/2^（n-2）]+…+1/2
Sn/2=n/2^(n+1）+[（n-1）/2^n]+ [（n-2）/2^（n-1）]+…+1/2^2
∴Sn/2=[1-(n+1)/2^n]/4
∴Sn=[1-(n+1)/2^n]/2

1,dai s ke
2,yi zi
3,zi si
4,mi s yi z
5,ao f
6,ai ou
7,ai m
8,en n
建议你,好好学习一下音标,不是很多.学好音标,你就可以很容易的说英语了.不是很难,相信自己.
where there is the way ,there is the river.

就是重读闭音节

Spring FestivalThe Spring Festival is the most important festival for the Chinese people and is when all family members get together, just like Christmas in the West. All people living away from home go back, becoming the busiest time for transportation systems of about half a month from the Spring Festival. Airports, railway stations and long-distance bus stations are crowded with home returnees.
The Spring Festival falls on the 1st day of the 1st lunar month, often one month later than the Gregorian calendar. It originated in the Shang Dynasty (c. 1600 BC-c. 1100 BC) from the people's sacrifice to gods and ancestors at the end of an old year and the beginning of a new one.
Strictly speaking, the Spring Festival starts every year in the early days of the 12th lunar month and will last till the mid 1st lunar month of the next year. Of them, the most important days are Spring Festival Eve and the first three days. The Chinese government now stipulates people have seven days off for the Chinese Lunar New Year.
Many customs accompany the Spring Festival. Some are still followed today, but others have weakened.
On the 8th day of the 12th lunar month, many families make laba porridge, a delicious kind of porridge made with glutinous rice, millet, seeds of Job's tears, jujube berries, lotus seeds, beans, longan and gingko.
The 23rd day of the 12th lunar month is called Preliminary Eve. At this time, people offer sacrifice to the kitchen god. Now however, most families make delicious food to enjoy themselves.
After the Preliminary Eve, people begin preparing for the coming New Year. This is called "Seeing the New Year in".
Store owners are busy then as everybody goes out to purchase necessities for the New Year. Materials not only include edible oil, rice, flour, chicken, duck, fish and meat, but also fruit, candies and kinds of nuts. What's more, various decorations, new clothes and shoes for the children as well as gifts for the elderly, friends and relatives, are all on the list of purchasing.
Before the New Year comes, the people completely clean the indoors and outdoors of their homes as well as their clothes, bedclothes and all their utensils.
Then people begin decorating their clean rooms featuring an atmosphere of rejoicing and festivity. All the door panels will be pasted with Spring Festival couplets, highlighting Chinese calligraphy with black characters on red paper. The content varies from house owners' wishes for a bright future to good luck for the New Year. Also, pictures of the god of doors and wealth will be posted on front doors to ward off evil spirits and welcome peace and abundance.
The Chinese character "fu" (meaning blessing or happiness) is a must. The character put on paper can be pasted normally or upside down, for in Chinese the "reversed fu" is homophonic with "fu comes", both being pronounced as "fudaole." What's more, two big red lanterns can be raised on both sides of the front door. Red paper-cuttings can be seen on window glass and brightly colored New Year paintings with auspicious meanings may be put on the wall.
People attach great importance to Spring Festival Eve. At that time, all family members eat dinner together. The meal is more luxurious than usual. Dishes such as chicken, fish and bean curd cannot be excluded, for in Chinese, their pronunciations, respectively "ji", "yu" and "doufu," mean auspiciousness, abundance and richness. After the dinner, the whole family will sit together, chatting and watching TV. In recent years, the Spring Festival party broadcast on China Central Television Station (CCTV) is essential entertainment for the Chinese both at home and abroad. According to custom, each family will stay up to see the New Year in.
Waking up on New Year, everybody dresses up. First they extend greetings to their parents. Then each child will get money as a New Year gift, wrapped up in red paper. People in northern China will eat jiaozi, or dumplings, for breakfast, as they think "jiaozi" in sound means "bidding farewell to the old and ushering in the new". Also, the shape of the dumpling is like gold ingot from ancient China. So people eat them and wish for money and treasure.
Southern Chinese eat niangao (New Year cake made of glutinous rice flour) on this occasion, because as a homophone, niangao means "higher and higher, one year after another." The first five days after the Spring Festival are a good time for relatives, friends, and classmates as well as colleagues to exchange greetings, gifts and chat leisurely.
Burning fireworks was once the most typical custom on the Spring Festival. People thought the spluttering sound could help drive away evil spirits. However, such an activity was completely or partially forbidden in big cities once the government took security, noise and pollution factors into consideration. As a replacement, some buy tapes with firecracker sounds to listen to, some break little balloons to get the sound too, while others buy firecracker handicrafts to hang in the living room.
The lively atmosphere not only fills every household, but permeates to streets and lanes. A series of activities such as lion dancing, dragon lantern dancing, lantern festivals and temple fairs will be held for days. The Spring Festival then comes to an end when the Lantern Festival is finished.
China has 56 ethnic groups. Minorities celebrate their Spring Festival almost the same day as the Han people, and they have different customs.
I like to study in the library-我喜欢在图书馆读书

Every Sunday morning, I get up at five in order to find a seat in the library. I like the quiet atmosphere in the library, which makes me deeply absorbed in my study. Besides, there are reference books in the library which provide ready guidance to help me solve my problems. At home people come and go--some talking, others working. Inevitably, there are often noises around the house which make me nervous and unable to concentrate on my study. For the reasons mentioned above, I like to study in the library.
第二篇：
It seems that most students like to study in the library, especially when there are examinations. I also like to study in the library. Because of the quiet atmosphere, I can better concentrate on my study. The diligence of other people in the library also inspires me to work even harder. I usually get more by studying in the library. The library is a good place to study only if we observe its rules, such as not talking loudly. Otherwise the value of the library will be greatly reduced.
第三篇：
Generally speaking, a library is a very quiet place. In a library, I can better concentrate and study more effectively. Besides, there are all kinds of books, magazines and newspapers in a library which provide you with a great deal of useful knowledge. The library is a place where your desire for knowledge can be satisfied. Nor can one do research without the help of a library. When I was in college, every semester I Had to write several papers. It was the indispensable library that enabled me to do the necessary research and finish my papers in time. It is difficult to imagine what life would be like without library. We should try to keep our library such a good place that it is by obeying the library rules. We should try to make our library not only a source of knowledge but also a source of inspiration.

这位同学请试译一下：
第1 句：天很冷,于是他们生了火 _________ （空里你会填“来取暖” 还是“已经暖和过来了”?）
第2句：Mary___________试卷,所以她看上去挺高兴的.（空里你会填“已经做完了”还是“要去做完”?）
另外补充一下,这两个例句都不涉及完成时,而是涉及动词不定式 的完成体.
过去式：句子里有一个明确的过去时间；
现在完成式：某动作或者现象起点在过去,一直延续到现在.比如：我在这个城市生活了10年了（从10年前一直到现在都生活在这里） / 我从来没有去过大海（“没去过大海”这件事一直到延续现在）.
希望对你有所帮助.