班上将开展一次文学名著知识竞赛活动,请你完成问题,为活动做好准备。

ermaomao2022-10-04 11:39:541条回答

班上将开展一次文学名著知识竞赛活动,请你完成问题,为活动做好准备。
1、假如你是主持人,请你为这次活动准备一段开场白。要求:讲明活动的意义,并至少运用一种修辞手法。
______________________________________
2、假如你是参赛选手,请根据作品补充故事情节。
孙悟空三打白骨精:孙悟空_______;孙悟空_______;孙悟空_______。

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czwbpn 共回答了22个问题 | 采纳率81.8%
1、参考示例:同学们:阅读文学名著能够引导我们关注人类,关注自然,理解和尊重多样文化;能够培养高尚的道德情操和健康的审美情趣,形成正确的价值观和积极的人生态度。古人云“三日不读书,面目可憎”,让读书成为我们的生活习惯。让我们在古今中外的名著海洋中邀游吧。
2、参考示例:大闹天宫;偷吃人参果;斗假猴王;三借芭蕉扇;高老庄降魔等。
1年前

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yoyo326 1年前 已收到1个回答 举报

dinjinwan 幼苗

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1年前

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在横线上将下列句子补充完整,并在括号内写出所填词语在句中的含义。
(1)放下__________过稻香的镰刀。(   )
(2)秋天__________在农家里。(   )
(3)秋天__________在渔船上。(   )
(4)秋天__________在牧羊女的眼里。(   )
(5)溪水因__________见石更清洌了。(   )
(6)用背篓来装竹篱间__________的瓜果。(   )
美丽之旅1年前1
大梦时空 共回答了20个问题 | 采纳率90%
(1)饱食:用拟人的手法写丰收之景。
(2)栖息:停留,休息。
(3)游戏:虚实相生,写出了秋天的活泼和渔人收获的喜悦。
(4)梦寐:睡梦。
(5)枯洞:干涸,没有水了。
(6)肥硕:果实又大又饱满。
从某一建筑物的楼顶平台上将一小石子以v0=12m/s水平抛出,不计空气阻力,测得小石子落到水平地面前最后1s内的位移是2
从某一建筑物的楼顶平台上将一小石子以v0=12m/s水平抛出,不计空气阻力,测得小石子落到水平地面前最后1s内的位移是20m.(g=10m/s2)求:
(1)最后1s内小石子下落的高度;
(2)小石子抛出后运动的总时间;
(3)建筑物楼顶平台距地面的高度.
水火不融1年前1
金戈跃马逐飞花 共回答了21个问题 | 采纳率95.2%
解题思路:(1)小球做平抛运动,水平分运动是匀速直线运动,竖直分运动是自由落体运动;先求解出最后1s的水平分位移,然后根据平行四边形定则得到竖直分位移;(2)设运动世间为t,高度为H,对竖直分运动运用位移时间关系公式两次列式求解即可.

(1)小球在最后1s内,水平分位移x2=v0t2=12m
位移S2=

x22+
y22=20m
由以上两式可得y2=16m
(2)(3)设建筑物楼顶平台的高度为H,石子下落的总时间为t,则有
H=[1/2]gt2
H-y2=[1/2]g(t-1)2
由以上两式可得t=2.1s,H=22.05m;
答:(1)最后1s内小石子下落的高度为16m;
(2)小石子抛出后运动的总时间为2.1s;
(3)建筑物楼顶平台距地面的高度为22.05m.

点评:
本题考点: 平抛运动.

考点点评: 本题关键明确平抛运动的运动学特点,求解出最后1s的竖直分位移后,利用位移时间关系公式多次列式求解,不难.

帮我写一篇关于我在校运会上将会做什么的英语短文
ikame1年前1
淑女异族 共回答了18个问题 | 采纳率100%
In the sports meeting,firstly,I will try my best to win the matches I attend.No matter how the result will be,I will never give in.
Secondly,I will be the cheer leader to encourage the players of my class.I will organize my classmates to yell for them and give them spiritual supports so that they will preform well.
Thirdly,I will keep the place where my class stay clean to protect the environment of my school.
阅读下面短文,从短文后各题所给的从四个选项中(A、B、C和D),选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。S

阅读下面短文,从短文后各题所给的从四个选项中(A、B、C和D),选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。
She was a five-year-old girl with very fine golden hair when I first met her. She was carrying a bowl of _ 36_ . I was 29 at that time and suffering from the flu.
Her mom and I had been friends for years._ 37 that friendship grew into care, from care into _38_ and marriage. Marriage brought the three of us together as a _ 39_ . At first I was afraid to be a “stepfather”. Therefore, I tried not to come _ 40_ my future daughter and her 41 father. I acted in that way in order to be liked. However, 42 she was growing up, I found it increasingly hard to 43 with her.
Once her school required the parents to individually write an open and 44 letter to our children. I wrote a letter about a little golden-haired girl who had 45 me a bowl of soup when I needed 46 .
A week later, all the parents 47 together with our children. The students were allowed to make a few statements. I was 48 to hear what my daughter would say.
Finally my daughter 49 make her way up to the microphone. She said something like others and then 50 , “At this very moment, I just want to say …I love you, Father.”
Immediately people around me started 51 at me. For a teenage girl to say 52 in front of so many people, “I love you,” took a great deal of courage.
Since then I have 53 to understand I didn’t need to have any 54 about being a stepfather. I can still 55 honest love with the same little girl I met so many years before - carrying a bowl full of what turned out to be kindness. I can also be friends with the girl - my dear daughter.
小题1:.
A.water B.soup C.milk D.juice
小题2:.
A.Immediately B.Finally C.Especially D.Generally
小题3:
A.like B.pleasure C.excitement D.love
小题4:
A.union B.group C.family D.whole
小题5:.
A.between B.among C.from D.for
小题6:
A.natural B.following C.untrue D.old
小题7:.
A.after B.as C.with D.before
小题8:.
A.connect B.share C.communicate D.argue
小题9:
A.honest B.formal C.powerful D.responsible
小题10:
A.taken B.shown C.shared D.brought
小题11:
A.cure B.care C.help D.friend
小题12:.
A.presented B.invited C.gathered D.asked
小题13:.
A.glad B.hopeful C.serious D.anxious
小题14:.
A.determinedly B.independently C.patiently D.unexpectedly
小题15:.
A.lasted B.declared C.continued D.responded
小题16:
A.hugging B.smiling C.kissing D.celebrating
小题17:
A.quietly B.openly C.brightly D.attractively
小题18:.
A.used
陈礼玄 1年前 已收到1个回答 举报

maobagss 幼苗

共回答了17个问题采纳率:100% 举报

小题1:B
小题2:B
小题3:D
小题4:C
小题5:A
小题6:A
小题7:B
小题8:C
小题9:A
小题10:D
小题11:B
小题12:C
小题13:D
小题14:A
小题15:C
小题16:B
小题17:B
小题18:D
小题19:B
小题20:A

1年前

3
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陈礼玄1年前1
maobagss 共回答了17个问题 | 采纳率100%
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一道化学工业题:工业上将FeCl2氧化为FeCl3通常用什么试剂?用Cl2和H2O2 (盐酸环境下)
一道化学工业题:工业上将FeCl2氧化为FeCl3通常用什么试剂?用Cl2和H2O2 (盐酸环境下)
工业上将FeCl2氧化为FeCl3通常用什么试剂?
用Cl2和H2O2 (盐酸环境下).
为什么要用双氧水呀
小风爱三三1年前1
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FeCl2+H2O2=FeCl3+2H2O
H2O2便宜,工艺简单
工业上将氯气制成漂白粉的主要目的是什么 制漂白粉的主要反映化学方程式是什么
工业上将氯气制成漂白粉的主要目的是什么 制漂白粉的主要反映化学方程式是什么
打错了 应该是
工业上将氯气制成漂白精的主要目的是什么
不是石头1年前1
傅寒庭 共回答了20个问题 | 采纳率85%
漂白粉故顾名思义就是为了漂白.当然氯气也有漂白功能,之所以不直接用氯气漂白是应为氯气是有毒,而且氯气和水反应时可逆的,生成的次氯酸也是非常的不稳定.而制作漂白粉的主要反应方程式是:2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O
漂粉精又名高效漂白粉,主要成分是次氯酸钙,根据生产工艺的不同,还含有氯化钙或氯化钠及氢氧化钙等成分,其有效氯含量大于60%.漂粉精具有很强的杀菌、消毒、净化和漂白作用,在洗毛、纺织、地毯、造纸等行业具有广泛的应用
请按要求回答下列问题:(1)硫酸钡有重要的用途,如在医学上将其加工为造影剂.写出稀硫酸与氢氧化钡溶液反应生成硫酸钡的离子
请按要求回答下列问题:
(1)硫酸钡有重要的用途,如在医学上将其加工为造影剂.写出稀硫酸与氢氧化钡溶液反应生成硫酸钡的离子方程式______.
(2)铝热反应在工业生产中的重要用途之一是______.
(3)“硅材料”又被称为信息材料.其中广泛用于光导纤维的材料是______(填化学式,下同);广泛用于制造集成电路的材料是______.
相思三颗心豆1年前1
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解题思路:(1)稀硫酸为强酸,氢氧化钡为强碱,都可拆分,生成的硫酸钡为难溶物,水为弱电解质,都不可拆分;
(2)铝热反应的原理是活泼金属在高温下置换出其它金属;
(3)硅是半导体,可用于制造集成电路的材料,二氧化硅透明度高,可用于做光导纤维.

(1)Ba2+和SO42-反应生成BaSO4沉淀,OH-和H+反应生成水,故离子方程式为Ba2++2OH-+2H++SO42-=BaSO4↓+2H2O,
故答案为:Ba2++2OH-+2H++SO42-=BaSO4↓+2H2O;
(2)铝热反应在工业生产中的重要用途之一是焊接钢轨,故答案为:焊接钢轨;
(3)广泛用于光导纤维的材料是二氧化硅,广泛用于制造集成电路的材料是硅,故答案为:SiO2;Si.

点评:
本题考点: 离子方程式的书写;硅和二氧化硅;铝的化学性质.

考点点评: 离子方程式的书写是高考不变的一个题型,每年高考必考,是热点题型.本题还考查了铝和硅的相关性质.

1.判断:工业上将氯气通入澄清石灰水制取漂白粉
1.判断:工业上将氯气通入澄清石灰水制取漂白粉
2.下列溶液中通入足量SO2后,最终一定会出现沉淀的是
A.Na2S B.Bacl2 C.Fecl3 D.Ca(OH)2
3.判断:可以用Bacl2溶液和稀硝酸检验Na2SO3是否变质.
4.NH3与O2在一定条件下反应,产物可以是N2,也可以是NO.
有点多了...能写下反应更好
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1工业上将氯气通入石灰乳中制漂白粉.因为.Ca(OH)2溶解度很小,澄清石灰水浓度太低.
2、A答案.硫离子与二氧化硫发生氧化还原反应生成硫单质.
3不能,因为亚硫酸钠变质生成硫酸钠,而稀硝酸会把亚硫酸根氧化成硫酸根,所以不管变没变质,加了氯化钡后都会生成硫酸钡沉淀.
4,4NH3 + 3O2 =点燃= 2N2 + 6H2O
4NH3 + 5O2 =催化剂/△= 4NO + 6H2O
给妈妈过生日英语作文要用上将来时、谢谢!
xuduobaichi1年前3
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There will be lots of difficulties in realizing your dream.
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As I am now a middle school student, I have many friends, but there is one I like best. I first met him when I began to go to school.
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小题2:The writer’s best friend only knows one language.
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小题4:When the writer feels bored, his best friend tells him something interesting.
小题5:The writer’s best friend is “Reading”.
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A. Hard work
B. Principles for success
C. Active learners
D. A sense of humor
E. A successful sales team
F. A head start
小题1:___________
I was hired to do some training for a sales team from one of the largest companies in America. There were 16 people on this team. That year their sales (for the 16 of them) were close to 250 million — that’s right, a quarter of a billion dollars! Needless to say, it was an excellent and interesting time. I decided to learn a little bit myself, so I watched them closely to see what kind of people they were and to see what common characteristics they shared.
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小题3:___________
They didn’t come from families that gave them a free pass into the upper rank of the business world and they didn’t get a head start from upper outside universities. What got them to where they are now? Hard work! That’s right, another example that if you put your mind to it, work hard and get in the right situation, you can achieve great things! These folks work long hours and are disciplined in the work they do. And it is paying off.
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第二节:信息匹配:(共5小题,每题2分,满分10分)阅读下列应用文及相关信息,并按照要求匹配信息。请在答题卡上将对应题号

第二节:信息匹配:(共5小题,每题2分,满分10分)
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Student Service Centre
The staff members are available to consult on career choice and applications for higher education.
Room Number:113
Tel: 8072 9771
Accommodation office
Mrs. J Marble is available each afternoon from 1:30 to 4:30 pm to assist students with problems relating to housing.
Room Number: 114
Tel: 8072 9772
Medical Room
Mrs. J Wright, the college nurse, is available each morning from 9:30 to 12:00 am. The college doctor is in attendance on Wednesday morning.
Room Number: 115
Tel: 8072 9773
Sports Office
Mrs. B Marie can provide information about sporting and keep-fit activities from 5:00 to 6:00 pm in the afternoon.
Room Number: 207
Tel: 8072 9774
Food Service
Mr. G Nunn is the manager and will do his best to help if you require a special diet on condition that you have already paid the tuition.
Room Number: 222
Tel: 8072 9775
Self Access Language Learning Centre
Students can attend a drop-in basis from 9:00 to 4:15 pm to improve your ability of listening and speaking.
Room Number: 203
Tel: 8072 9776
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如果水分子之间没有氢键存在,地球上将会是什么面貌?
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冰可能不存在,水的比热容变小,由此产生一系列问题.
某个体商贩由于不了解市场,进了一批过时服装,售价比进价提高20%售出,结果卖不出去,只好在此基础上将售价降低20%出售,
某个体商贩由于不了解市场,进了一批过时服装,售价比进价提高20%售出,结果卖不出去,只好在此基础上将售价降低20%出售,这样每件服装只卖了96元钱,问该商贩每卖出一件服装是赚还是赔,还是不赔不赚,赚了赚多少,赔了赔多少?
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解题思路:首先根据题意可设成本价为x元,然后根据主要条件列方程求解即可.

设每一件服装的成本价为x元,
由题意得:(1-20%)(1+20%)x=96
解得:x=100
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答:该商贩每卖出一件服装赔4元.

点评:
本题考点: 一元一次方程的应用.

考点点评: 此类题主要认清成本以及售价之间的关系,列出方程即可解答.

上将与下士乔治·华盛顿是美利坚合众国的第一任总统。就是他领导美国人民为了自由为了独立浴血奋战,赶走了统治者。 乔治·华盛
上将与下士
乔治·华盛顿是美利坚合众国的第一任总统。就是他领导美国人民为了自由为了独立浴血奋战,赶走了统治者。
乔治·华盛顿是个伟人,但他若在你面前,你会觉得他普通得就和你一样,一样的诚实、一样的热情、一样的与人为善。
有一天,他穿着大衣独自一人走出营房。他所遇到的士兵,没一个认出他。在一处,他看到一个下士领着手下的士兵筑街垒。
“加把劲!”那个下士对抬着巨大水泥块的士兵们喊道:“一、二、加把劲!”但是,那下士自己的双手连石头都不碰一下。因为石块很重,士兵们一直没能把它放到位置上。下士又喊:“一、二、加把劲!”但是士兵们还是不能把石块放到位置上。他们的力气几乎用尽,石块就要滚下来。
这时,华盛顿已经疾步跑道跟前,用强劲的臂膀,顶住石块。这一援助很及时,石块终于放到了位置上。士兵们转过身,拥抱华盛顿,表示感谢。
“你为什么光喊加把劲而让自己的手放在衣袋里呢?”华盛顿问那下士。
“你问我?难道你看不出我是这里的下士吗?”
“哦,这倒真是!”华盛顿说着,解开大衣钮扣,向这位鼻孔朝天,背绞双手的下士露出他的军装。“按衣服看,我就是上将。不过,下次在抬重东西的时候,你就叫上我!”
你可以想象,那位下士看到站在自己面前的是华盛顿本人,是多么羞愧,但至此他才真正懂得:伟大的人之所以伟大,就在于他决不做逼人尊重的人所做出的那种倒人胃口的蠢事。
1.分别指出下列句子表现了人物的什么性格特征
(1)乔治·华盛顿是个伟人,但他若在你面前,你会觉得他普通得就和你一样,一样的诚实、一样的热情、一样的与人为善。
表现了华盛顿:_____________________________________________________(2)加把劲!”那个下士对抬着巨大水泥块的士兵们喊道:“一、二、加把劲!”但是,那下士自己的双手连石头都不碰一下。
表现了下士:_________________________________________________________
2.文章第二自然段在结构上起什么作用。
__________________________________________________________________
3.画出短文的中心句
不好不给分
shengwumanyou1年前1
B-B-ONE 共回答了24个问题 | 采纳率100%
(1):表现了华盛顿平易近人,为美利坚之民主和美利坚民主的生存空间的做出了极大的贡献。
(2):表现了下士傲慢、滥用权力的行为。
2.从士兵们的表现衬托出华盛顿将军的平凡。
3.短文中心句是:伟大的人之所以伟大,就在于他决不做逼人尊重的人所做出的那种倒人胃口的蠢事。
或者是: 乔治·华盛顿是个伟人,但他若在你面前,你会觉得他普通得就和你一样,一样的诚实、一样的热情、一样的与人为善。
简介:华盛顿将军是近代史上最伟大的领导人之一,和孙中山、戴高乐有一拼,就他仨很伟大,别的虽说是还行,但是和他们三个比起来,有差距......
请仿照划“ ”部分的表述,在横线上将语段补写完整。(6分)
请仿照划“ ”部分的表述,在横线上将语段补写完整。(6分)
大自然能给我们许多启示: 大地能载万物,是在告诉我们求学要广读博览;青松不惧风雪,是告诉我们做人要坚毅
lumber021年前0
共回答了个问题 | 采纳率
如果班上将要举行以“微笑着面对生活”为主题的演讲比赛,请你完成以下任务(三小题)一条语文综合性题目
如果班上将要举行以“微笑着面对生活”为主题的演讲比赛,请你完成以下任务(三小题)一条语文综合性题目
1;拟写标语:为营造活动氛围,请你拟一条简洁优美,富有感染力的标语.
2;简述事例,如果你的演讲中要举出“名人笑对挫折”的事例作为论据,请你仿造例句简述一个事例.
例句:司马迁遭受宫廷之后,发奋著书,写出了被鲁迅誉为“史家之绝唱,无韵之离骚”的名著《史记》
3;提出建议;你以“微笑着面对生活”为主题的综合性学习活动,出了进行演讲比赛外,还可开展什么形式的活动?写出两条.
hannover771年前1
Duw9bjkF 共回答了22个问题 | 采纳率95.5%
1、如不以微笑面对,那怎可以生活下去.
扯起自己的嘴角,才能淡然面对接下去的生活.
2、韩信胯下受辱,忍人之不能忍,开国功臣,被杨美益《过韩信岭》:“蹙项方成皇帝尊,功劳一半属王孙.
3、收集微笑面对生活的功臣的事件.让自己学会淡然面对.
可以收集 最感人的视频,让自己开怀,学会心胸广阔
我们英语课的公开课上将要举行一场辩论会.我作为反方,辩论主题是money is not everything.大家帮忙提
我们英语课的公开课上将要举行一场辩论会.我作为反方,辩论主题是money is not everything.大家帮忙提供一些论据,尽量联系实际的,理论性的东西不要太强.还有,尽量少出现money can buy````,but can't buy```的句子,因为太常见了.
最好不要用百度上一搜就有的答案吧 ``那个我也能找得到`
4900001年前1
z53575430 共回答了12个问题 | 采纳率83.3%
Money Is Not Everything Money and Morality Almost all material things here on earth can be bought with money.Money is a medium of exchange to acquire any services or material things that we want or ne...
.放映幻灯时,、,使幻灯片到镜头的距离缩短为4厘米时,则银幕上将出现什么?
.放映幻灯时,、,使幻灯片到镜头的距离缩短为4厘米时,则银幕上将出现什么?
3.放映幻灯时,幻灯片到镜头的距离为10厘米,倒放的幻灯片在银幕上成正立、放大的像.若调节镜头的位置,使幻灯片到镜头的距离缩短为4厘米时,则银幕上将出现什么?
A 得到放大倒立的想 B不能在屏幕上成像 C 得到一个小的光斑 (不定项选)
ugjh1年前1
amour_huang 共回答了19个问题 | 采纳率94.7%
选B
幻灯机的原理是用光源照射幻灯片,通过一个凸透镜将像放大,再通过一个倾斜放置的平面镜使像正立
现在物距10cm能成放大像,说明在1倍到2倍焦距
也就是说焦距大于5cm
将物距缩短到4cm,小于焦距,也就无法在屏幕上成像了
名著阅读。班上将开展一次文学名著知识竞赛活动,假如你是参赛选手根据作品补充故事情节。孙悟空三打白骨精;孙悟空______
名著阅读。
班上将开展一次文学名著知识竞赛活动,假如你是参赛选手根据作品补充故事情节。
孙悟空三打白骨精;孙悟空____________________;孙悟空____________________。
黄头小孩儿1年前1
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示例:孙悟空大战红孩儿;孙悟空三借芭蕉扇;孙悟空大闹天宫。(答案不唯一)
英语完形填空项并在答题卡上将其涂黑.One night last summer,my neighbor Debbie c
英语完形填空
项并在答题卡上将其涂黑.One night last summer,my neighbor Debbie came over and knocked on my door."I'm leaving for 16 ,Jim,"she said."Would you mind dropping by my house in a while and 17 on my mother?" "Not a problem," I said.I'd lived
brachi1年前1
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你想表达啊
阅读下面的对话,根据上下文将空缺的内容补充完整,完成对话。每空不限填1个单词。并在答题卡上将答案填写在时应题号的横线上。
阅读下面的对话,根据上下文将空缺的内容补充完整,完成对话。每空不限填1个单词。并在答题卡上将答案填写在时应题号的横线上。
W: Hello,who is that speaking?
M: _______小题1:____________.
W: Hi,Mary.
M: Hi ,Jim.
W:_______ 小题2:___________?
M:I was hurt in a car accident.
W:__ 小题3:_____.Is it serious?
M: Nothing serious.
W: Did you see a doctor?
M: Of course.
W: ______小题4:_____________?
M: The doctor asked me to stay in bed for one or two days.
W: Take care of yourself.When are you going to school?
M: I can’t make sure.I’m afraid I will miss more lessons.
W: __小题5:___.I will help you.
M:Thank you,
W: You are welcome.
sheshiyidu1年前1
jesuisxiagaoqin 共回答了22个问题 | 采纳率90.9%
小题1:This is Mary speaking.
小题2:What’s the matter with you?/What’s wrong with you?
小题3:I’m sorry to hear that.
小题4:What did the doctor say?
小题5:Don’t worry.

几道初一科学题,1.地球在不停地自转着,假定有一天地球忽然停止了自转,这时地球上将发生这样一些现象:至少写出3条:2.我
几道初一科学题,
1.地球在不停地自转着,假定有一天地球忽然停止了自转,这时地球上将发生这样一些现象:至少写出3条:
2.我们知道,地球斜着身子自转,假如有一天,地球开始"站正身子"自转,那么又将发生哪些与现在不同的现象呢?请写出三条.
lovemissing1年前1
难过冰 共回答了15个问题 | 采纳率93.3%
1 黑夜变成半年 白昼变成半年
夏季变成半年,比以往更加炎热 冬季更加寒冷,比以往更加寒冷
南极与北极在它们各自的夏天时将融化更多的冰
南极与北极在它们各自的夏天时冰山,冰川活动更加剧烈
在北极的冬天时北极冰陆将比上个冰河世纪以来任何时候面积更大
2 全球温度基本根据纬度决定,不同纬度有差别,但是同纬度基本不再变化
南北回归线以外没有四季变化,根据纬度不同,同纬度基本就是一个季节(回归线以内原来基本也没有)
季风受到影响减少,洋流受到影响减少
生物遗传学问题遗传学上将染色体上某一区段及其带有的基因一起丢失引起的变异叫缺失,缺失杂合子的生活力降低但能存活,缺失纯合
生物遗传学问题
遗传学上将染色体上某一区段及其带有的基因一起丢失引起的变异叫缺失,缺失杂合子的生活力降低但能存活,缺失纯合子常导致个体死亡.现有一红眼雄果蝇XB Y与一白眼雌果蝇XbXb杂交,子代中出现一只白眼雌果蝇.请采用两种方法判断这只白眼雌果蝇的出现是由于缺失造成的,还是由于基因突变引起的.
答案是:选该白眼雌果蝇与红眼雄果蝇杂交.若杂交子代中雌果蝇数与雄果蝇数的比为1:1,则这只白眼雌果蝇的出现是由于基因突变引起的;若杂交子代中雌果蝇数与雄果蝇数的比为2:1,则这只自眼雌果蝇的出现是由于缺失造成的
我不太明白这个1:1和2:1是为什么
高手高手你在哪里~ 本人是高考党,请用高考的内容解释一下,谢谢~
p68695171年前1
正山小子 共回答了19个问题 | 采纳率84.2%
红眼雄果蝇XBY与一白眼雌果蝇XbXb杂交,子代中出现一只白眼雌果蝇.杂交的结果是
亲代: XBY XbXb
配子: XB Y Xb
子代基因型: XBXb XbY
子代表现型: 红眼雌果蝇 白眼雄果蝇

子代应该没有白眼雌果蝇的,既然出现了白眼雌果蝇,这有两种可能:

第一种,亲代基因突变造成的,也就是XBY的雄果蝇由于基因突变产生了一个Xb的配子,结果出现的白眼雌果蝇的基因型就是XbXb,如果是这样的话,选该白眼雌果蝇与红眼雄果蝇杂交,
即XbXb与XBY杂交 ,后代出现XBXb:XbY=1:1,也就是雌蝇:雄蝇=1:1;

第二种,由于缺失造成的,也就是XBY的雄果蝇形成配子时缺失了一个B基因,形成了一个X(上面没有B基因),这个配子与Xb结合,形成XXb的白眼雌果蝇,如果是这样的话,选该白眼雌果蝇与红眼雄果蝇杂交,
即XXb与XBY杂交 ,后代出现XXB(红眼雌蝇):XY(由于没有眼色的基因而死亡):XBXb(红眼雌蝇):XbY(白眼雄蝇)=1:1:1:1,也就是雌蝇:雄蝇=2:1.
要具体算式,等边三角形ABC的边长为6厘米,在一条直线上将它翻滚几次,使A点再次落在这条直线上.那么A点在翻滚过程中经过
要具体算式,等边三角形ABC的边长为6厘米,在一条直线上将它翻滚几次,使A点再次落在这条直线上.那么A点在翻滚过程中经过的总长度多少?如果三角形ABC的面积约是15平方厘米,那么三角形在滚动过程中扫过的面积是多少
amin_cn1年前2
浮沉随风 共回答了9个问题 | 采纳率88.9%
在一条直线上将它翻滚几次,使A点再次落在这条直线上,A点在翻滚过程中经过的总长度是两个半径为6厘米120度的弧长即2π×6÷3×2=8π(厘米)
如果三角形ABC的面积约是15平方厘米,那么三角形在滚动过程中扫过的面积是两个半径为6厘米120度的扇形的面积外加一个三角形的面积即6×6π÷3×2+15=24π+15(平方厘米)
制造一个三角形纸片演示一下,观察观察,自然会发现.