张伟读一本故事书每天读24,八天可读完,如果要6天读完,每天要读多少页

B

解题思路：根据题意，运用分数乘法的意义先求出红球的个数，再设有x个篮球，利用比例的基本性质解答即可．

100×28%=28（个），
设篮球x个，
4：5=28：x，
x=35，
答：篮球有35个．

点评：
本题考点： 百分数的实际应用；比的应用．

考点点评： 本题运用比例解答第二步比较简单，考查了比例基本性质的掌握与运用．

thanks for your letter. from your letter i know you have some trouble in study before the final exam. you should be more confident first and do some sport to make yourself relax. go to bed early .

珍惜阿萨

1,（4,7）
2,9 15

Dear Kevin,
I very pleased to welcome you in the name of my whole class to come to China for learning Chinese.
First of all, I want to tell you the weather in Haerbin. It might rain on the day you' ll arrive, so I suggest you to wear a thick jacket because it will be very cold then. Actually, I would say, it's not necessary to take an umbrella with you, because there will be somebody who will take you from the airport to your hotel by car.
I know your goal is to study Chinese at our school, so I have got some advice for you which you might need. I know from my experiences, that it's totally effective to read books in Chinese. You don't like reading at all? Well, that's not a problem, I believe you will enjoy Chinese films. If you have problems with pronunciations, listening and singing Chinese songs will be a good solution and isn't boring. These pieces of advice don't sound like learning at all? Well, in that way, I got my marks in English, too.
I' m already looking forward to that day of your arrival, the next time, we will meet at our school, I guess.
Best wishes for your flight.
Yours faithfully,
Wei Zhang

D

然后呢!亲想我减缓紧张吗.可以把他们都当成亲人就可以了,加油!

Dear friend I am Li Ming I heard a bad news thatyou had a bad score。that is OK vheer up。you must be more hard and Ibelieve you will get a better score，

解题思路：显酸性的物质能使钙以离子的形式游离出来，有利于增加汤中钙的含量；当溶液的pH等于7时，呈中性．当溶液的PH大于7时，呈碱性．当溶液的pH小于7时，呈酸性．胃酸内含有盐酸显强酸性，胃酸过多的人不易多吃酸性食品．

A、煮骨头汤时加点醋，有利于增加汤中钙的含量，因为食醋中含有醋酸，醋酸能使钙以离子的形式游离出来．故选项正确；
B、牙膏的pH大于7，显碱性．故选项错误；
C、酱油的pH小于7，显酸性，不能使酚酞变红色．故选项错误；
D、胃酸过多的人不宜多吃葡萄，因为葡萄汁的pH小于7，显酸性．故选项错误．
故选A．

点评：
本题考点： 溶液的酸碱性与pH值的关系．

考点点评： 解答本题要掌握各种物质的性质方面的知识，只有这样才能对相关方面的问题做出正确的判断．

One possible version：
To Whom It May Concern,
Nowadays, there are more and more people planning to buy their own cars. The following is my opinions regarding this issue.
First of all, car provide us with great convenience so that people can drive every where they want and save a lot of time. Car is also a very suitable transportation tool for travel. Furthermore, driving car is much safer than riding bicycles.
On the other hand, the increasing number of personal cars causes severe problems, such as air pollution, traffic congestion and more accidents.
Therefore, I suggest that maybe the government can control the number of cars by regulations.
Yours truly,
Zhang Wei

略

本来他应该走出去的,然后他也许是忘了剧本,或者记错剧本了

dear Tony,
i'm your penfriend Zhangwei.As you know,one of the Chinese traditional festival,the Spring Festival is coming,so we will have a long holiday.Here I want to share my plan with you.I'm so excited that my families and I are going to travel in Hainan province,an island provice,which is closest to the equator in China.So there would be warm in winter and we could enjoy the sunshine and the beautiful beach.In addition,Hainan is a tourist city with the duty free shop,so we could by some duty free stuff,which must be cheaper then other cities in Chinese mainland.
Wish you a good day,and I'm looking forward to your reply.
your's Zhangwei

解题思路：小孔成像的原理是光沿直线传播，小孔成像是倒立的实像．

小孔成像是由于光的直线传播形成的，物体经过小孔成的像是倒立的实像，而不是光斑，像的形状与物体相同，而与小孔的形状无关．
故选C．

点评：
本题考点： 光在均匀介质中直线传播．

考点点评： 本题主要考查小孔成像的原理及特点的了解和掌握，成像的物体是蜡烛，像的形状与孔的形状无关．

实木地板是木材经烘干,加工后形成的地面装饰材料.它具有花纹自然,脚感舒适,使用安全的特点,是卧室、客厅、书房等地面装修的理想材料.实木的装饰风格返璞归真,质感自然,在森林覆盖率下降,大力提倡环保的今天,实木地板则更显珍贵.实木地板分AA级、A级、B级三个等级,AA级质量最高.
实木地板的标准是GB/T15306-2001.该标准自2002年5月1日起实施,原94标准同时被替代.新国标对老国标作了重要的修改和补充.主要是修改了一些尺寸和缺陷的内容,补充了适用树种的规范称和对漆板的要求.同时取消了对木材冲击韧性硬度和耐磨性方面的要求.
过去市场一度名称名称乱标,名称稀奇古怪,以至假冒伪劣混杂其间,什么金丝柚、金不换、富贵木,使顾客真假难分,好坏不识.所以新标准规定必须严格标称,并以附录形式规定.销售时应以权威部门出具的检测报告为准.
1.实木地板主要树种
实木地板因材质的不同,其硬度、天然的色泽和纹理差别也较大,大致上有以下一些：
槲栎（柞木）、花梨、重蚁木（依贝）、冰片香（山樟）香二翅豆、甘巴对、鲍迪豆、坤甸铁樟（铁木）、山榄木等.
中等：柚木、印茄（菠萝格）、娑罗双（巴劳）、香茶茱萸（芸香）.
软：水曲柳、桦木.
浅色：水青冈（山毛榉）、桦木、山榄木.
中间色：槲栎、水曲柳、娑罗双、香茶茱萸.
深色：柚木、印茄、重蚁木、香二翅豆、木荚豆（品卡多）.
粗纹：柚木、槲栎、甘巴豆、水曲柳.
细纹：水青冈、桦木.
2.实木地板的含水率
木材中所含的水分有三种形式,一种是存在于细胞腔与细胞间隙中的水,也就是存在于毛细管中的水,称为自由水.第二种是被细胞壁所吸收的水,称为吸附水.第三种是构成细胞组织的水,称为化学水.
当潮湿的木材水分蒸发时,首先失去的是自由水,当自由水蒸发完而吸附水尚处于饱和状态时的含水率,称为纤维饱和点含水率.
纤维饱和点是木材性能的转折点,在纤维饱和点之上,木材的强度为恒量,不随含水率的变化而变化.同时木材也没有胀缩这种体积上的变化.当含水率降至纤维饱和点之下,也就是细胞壁中的吸附水开始蒸发时,强度随含水率下降而增加,而湿胀干缩的现象也明显呈现出来.不同的木材纤维饱和点含水率约在22%~33%之间.
自然界中各地区的湿度和温度在不同的季节都有相对的稳定.木材长时间地处在这种相对温湿度环境中,其含水率会达到会达到一个相对的恒定.这时的含水率就称为平衡含水率（例如上海地区的年平衡含水率为4.6%）.
木材的平衡含水率随它们所处环境的温度和湿度的变化而变化,当平衡含水率和环境湿度有差值时,会趋向于接近环境.这就产生了木材的湿胀与干缩现象,这是木材特有的物理现象.
木材又是一种各向异性体.实际使用中的木材其含水率都在纤维饱和点以下,所以水分的得失主要是细胞壁的吸附水.木材的细胞绝大多数是纵向生长的,它的胀缩都是和细胞壁方向垂直的.作为一块地板,我们可以发现其纵向一般都没有什么胀缩,而宽度方向的胀缩率一般为3％～6％（系指木材含水率在纤维饱和点含水率以下的变化）.
由此可见,控制好地板的含水率是十分重要的.不但生产中必须重视,在铺设中更应重视,不让地板受潮产生变形.
3.实木地板的干燥平衡处理
目的
（1）达到规定的适应使用地区环境特点的平衡含水率.
（2）消除木材在生长和加工过程中存在和产生的内应力.
（3）调整和恢复变形.
由于上海地区年平衡含水率为15.6％,因此用于上海的地板含水率宜控制在10％～14％.
（1）自然干燥,约需30～40天,使含水率达到30％左右.
（2）人工干燥,约需10～30天,使含水率达到10％以下.这一过程同时使木材内的浆汁蒸馏出来,均衡木材细胞壁组织,干缩性能趋于稳定一致.
（3）养生处理,约需10～20天.通过这一过程最后达到木材干燥的三个目的.

设小明用的时间为t，则速度为v ₁ =
100m
t ，
张伟的速度为 v ₂ =
100m-5m
t =
95m
t ，
第2次比赛时，s ₁ ′=100m+5m=105m，s ₂ ′=100m，
因为速度不变，
小明用时：
t ₁ ′=
s′ 1
v 1 =
105m

100m
t =
21
20 t，
张伟用时：
t ₂ ′=
s′ 2
v 2 =
100m

95m
t =
20
19 t，
因为
21
20 t＜
20
19 t，
所以t ₁ ′＜t ₂ ′，因此还是小明先到达终点．
故选A．

解题思路：设含金量为m_金，则铜的质量为18g-m_金，利用公式V=[m/ρ]分别列出金和铜的真正体积V_金和V_铜，利用关系式V_金+V_铜=10cm³列方程，求出戒指中所含金的质量．最后求出戒指中金含量的百分比即含金量．

已知：m=18g，V=1.5cm³，ρ_铜=8.9g/cm³，ρ_金=19.3g/cm³
求：m_金

∵ρ=[m/V]，
∴V=V_金+V_铜=1.5cm³，
即V=
m金
ρ金+
m−m金
ρ铜，

m金
19.3g/cm3+
18g−m金
8.9g/cm3=1.5cm³，
解得：m_金≈8.629g，则该戒指的含金量为[8.629g/18g]×100%=47.9%．
答：该戒指的含金量是47.9%．

点评：
本题考点： 密度公式的应用．

考点点评： 本题有一定的难度，在求戒指的含金量时我们用到了方程法．需要注意的是在我们物理学的计算中，所设的未知量是一个完整的物理量，它既包含了数值的大小也包含了相应的单位．就像该题中我们设戒指中金的质量为m金，求得的结果m金≈8.629g既有大小又有单位．

D

小题1:参考：张伟得了急性阑尾炎，正在市中心医院等待手术，需2000元钱。（要简要介绍要2000元钱的原因）
小题2:参考：我班同学病了，我在照顾他。（要简要地介绍自己没有回家的原因）
小题3:参考例句 ：是饱经飞沙走石的沙漠，是敲打谎言虚伪的冰雹。

略

口语交际1 (1)张伟得了急性难尾炎,正在中心医院等待手术,急需2000元.(2)我同学张伟病了,我在医院照顾他.语言运用 1.成功了!成功了!我们的祖国终于取得了奥运会的举办权,这是能让我们母亲重绽笑颜的时候.这时的祖国就像春天一样生机勃勃.2.我的家在湄洲湾海畔,那里有旅游圣地湄洲岛,还有那满山遍野的龙眼荔枝.探究实践 (1)由一得出的结论:中国的人均耕地远远低于世界水平.由二得出的结论:中国人均耕地呈锐减趋势.(2)我们必须大力保护耕地,控制人口增长.语言表达:1.黄河是我们的母亲河,我爱黄河,就像爱我的母亲一样.2.万里长城--抵御外侵,坚强不屈.表现出民族之魂与民族之神.3.保护我们的母亲河--黄河!还黄河母亲一个洁净容颜!

Zhang wei is very clever, but on the other hand he made many mistakes

My name is Zhang Wei. I was born in Ningbo, Zhejiang Province in March, 1998. I study in Ningbo Foreign School. I have worked for our school newspaper for two years. I like English writing and computer best and I am very good at them. Last year, I won the first prize in the school English speech contest. I enjoy reading English stories and collecting stamps. My favorite sport is basketball. My e-mail address is liming@126.com.

解题思路：要求平均每加工一个零件要几分钟，平均分的是分钟数；平均每分钟加工几个零件，平均分的是零件数；都用除法计算．

解；平均每加工一个零件的分钟数：5÷4=1.25（分钟）；
平均每分钟加工零件的个数：4÷5=0.8（个）．
答：平均每加工一个零件要 1.25分钟，平均每分钟加工 0.8个零件．
故答案为：1.25，0.8．

点评：
本题考点： 分数除法应用题．

考点点评： 此题属于基本的分数除法应用题，关键是弄清平均分的是哪个量，再用除法计算．

：A

A、煮骨头汤时加点醋，有利于增加汤中钙的含量，因为食醋中含有醋酸，醋酸能使钙以离子的形式游离出来．故选项正确；
B、牙膏的pH大于7，显碱性．故选项错误；
C、酱油的pH小于7，显酸性，不能使酚酞变红色．故选项错误；
D、胃酸过多的人不宜多吃葡萄，因为葡萄汁的pH小于7，显酸性．故选项错误．
故选A．

1）每空1分
平均成绩（分） 中位数（分）众数（分） 方差（S2）
王华 80 80 80 60
张伟 80 85 90 260
（2）张伟（3分）
（3）略（4分）

略

Zhang Wei has__ _a_bad _cough_.
希望能够帮到楼主

解题思路：根据题意，张伟五门功课的平均成绩是92.2分，那么他五门功课的总成绩是92.2×5分；英语成绩公布后，他的平均成绩下降了1.7分，也就是他六门功课的平均成绩是92.2-1.7分，然后根据“六门功课的总成绩-五门功课的总成绩=英语的成绩”．解答即可得．

（92.2-1.7）×6-92.2×5，
=90.5×6-92.2×5，
=543-461，
=82（分），
答：张伟的英语成绩考了82分，
故答案为：82．

点评：
本题考点： 平均数的含义及求平均数的方法．

考点点评： 此题根据“平均成绩×门数=总成绩”进行解答．

1.他得了急性阑尾炎,需立即动手术,希望你们拿2000元手术费速到.
2.我同学生病住院,我在陪他.

Dear John,
I hear that you smoke heavily.Is it right?As you know,many people suffer from lung cancer which derives from smoking most of the time and die at last every year.It's true ,for the...

解题思路：根据题意，运用分数乘法的意义先求出红球的个数，再设有x个篮球，利用比例的基本性质解答即可．

100×28%=28（个），
设篮球x个，
4：5=28：x，
x=35，
答：篮球有35个．

点评：
本题考点： 百分数的实际应用；比的应用．

考点点评： 本题运用比例解答第二步比较简单，考查了比例基本性质的掌握与运用．

解题思路：解决此题要知道物质由液态变成气态，是汽化过程，汽化是吸热的，油的沸点比水的高．

汽化是物质由液态变为气态的过程，小水滴变成水蒸气，是汽化现象，汽化时需要吸热，使体温降低；由于油的沸点比水的高，因此看不见油冒气泡．
故答案为：汽化；高．

点评：
本题考点： 汽化及汽化吸热的特点；沸点及沸点与气压的关系．

考点点评： 掌握“固态--液态--气态”三态之间变化名称，以及吸热和放热情况，并能应用于生活中，能解释生活中有关的物态变化．

Hi,Li Hua
I heard that you attended an English speech contest,heard the news I'm happy for you.In fact,this is a good opportunity to exercise,you do not have to be too tight,the only way you can find his own shortcomings,so they have a greater chance of progress.First,you make adequate preparations before the game,change their attitude is very important.Again,in his speech,when a deep breath,try to imagine yourself just in talking with friends,in a relaxed manner to treat.Multi and judges eye contact and smiling,I hope you can successfully pass!Come on!

Dear Wang Nan,
  I know you are feeling annoyed these days because you are not able to communicate with others effectively.
As the saying goes, “Every man has his faults”. I notice some people around us are also not good at communication, so you don’t have to worry too much about it. Of course, good communication is important for us to create a pleasant relationship with others, which can increase our chance of success. That is why I would like to offer you some advice on how to develop effective communication skills.
Firstly, be direct and honest to those you talk to so that they can understand you easily. Secondly, be aware of what you want to say and express yourself clearly. Thirdly, learn to understand others when they talk so that you can exchange ideas with them.
I hope my advice will be of help to you.
    All the best.
Yours sincerely,
                                                                 Zhang Wei

他爸爸跑343,他跑457

解题思路：光沿直线传播是小孔成像的原理，倒立的实像是小孔成像的特点．

人孔成像的原理是光沿直线传播，所以从烛焰射出的光线，经人孔正好射到光屏的底部，从蜡烛底部射出的光线经人孔正好射到光屏的上部．故所成的像是倒立的实像．
故答：C．

点评：
本题考点： 光直线传播的应用．

考点点评： 本题主要考查学生对光沿直线传播的应用，即小孔成像的原理，及特点的了解和掌握，是一道基础题．

Dear Li Hua,
I'm sorry to hear that you are suffering from heavy pressure and anxieties from college entrance examination．
I hope you can keep high spirit and keep self-confidence to make redy for the entrance examination．The exam is coming,we may anxious but it isn`t terrible,we should learn to do something to relax ourselves.Such as listen to the music,it`s good for us as it can make us relax;We should do some exercise to keep us stength;Try to make a talk with parents or friends,they can help you get out from pressure.The most important thing is that whether we get succeed or get fail in this exam,it won`t decide our whole life.
Best regards
ZhangWei

Dear Li Hua,
I'm sorry to hear that you are suffering from heavy pressure and anxieties from college entrance examination．
I hope you can keep high spirit and keep self-confidence to make redy for the entrance examination．The exam is coming,we may anxious but it isn`t terrible,we should learn to do something to relax ourselves.Such as listen to the music,it`s good for us as it can make us relax;We should do some exercise to keep us stength;Try to make a talk with parents or friends,they can help you get out from pressure.The most important thing is that whether we get succeed or get fail in this exam,it won`t decide our whole life.
Best regards
ZhangWei

C

不能，钱都不够，说明二人本来就都坐不了，凑一起也没用

解题思路：光沿直线传播是小孔成像的原理，倒立的实像是小孔成像的特点．

小孔成像的原理是光沿直线传播，所以从烛焰射出的光线，经小孔正好射到光屏的底部，从蜡烛底部射出的光线经小孔正好射到光屏的上部．故所成的像是倒立的实像．
故答案为：蜡烛的倒立像．

点评：
本题考点： 光在均匀介质中直线传播．

考点点评： 本题主要考查学生对光沿直线传播的应用，即小孔成像的原理，及特点的了解和掌握，是一道基础题．

Dear wang nan
I have just received your letter.And I know you have some problems with communicate with others,Don't worry about it ,I know you are a shy girl.But that's not a problem.
Chat with your parents first.Than you wil be more outgoing and you wil communicate with others easier.You also can make some friends on the internet.You can chat with them without face to face.It's halps a lot to chat with your friends and classmates in real life.
And don't close yourself ,communicate with others is important.So do as what I tell you.
Good luck!
Yours
zhang wei

I am afraid it may also have you hurt.
Tom felt a little bit nervous.
Zhang wei introduced his friend to me.
Come and have a look at my family photo.
GO down the fifth avenue and you will find a supermarket on your right.
Our company is across from the bank.
Jim,take your books away,I have finished them.
It is so exciting to get the news.
There is less time for students to enjoy themselves.
They decided not to kill annimals any longer last week.

B

买进成本是5.87*1000*（1+0.3%）=5887.61
卖出的收入：7.2*1000*（1-0.3%-0.1%）=7171.2
他一共慊了：7171.2-5887.61=1283.59元

解题思路：先把课外书页数看作单位“1”，依据分数乘法意义，求出第一天看书页数，并把此看作单位“1”，第二周比第一周少看了[3/10]，就是第二周看了第一周的1-[3/10]=[7/10]，依据分数乘法意义，求出第二周看书页数，最后根据第三周开始看页数=第一周看页数+第二周看页数+1页即可解答．

180×[2/9]+180×[2/9]×（1-[3/10]）+1
=40+40×[7/10]+1
=40+28+1
=69（页）
答：第三周该从第69几页开始看．

点评：
本题考点： 分数四则复合应用题．

考点点评： 解答本题的关键是求出前两周看书页数．

Time:April 15,2011
Subject:go to the hospital to accompany DENG Tao
Content:
Time:on April 15,2011
Reason:accompany a DengTao to the hospital
Content:
My dorm students play basketball DengTao not carefully,lead to his ankle injury.Now he is walking is not convenient,needing caring .Zhang accompanied him to the city hospital.So he can not come to class.He want take a day off to the professor,He ensures that he will make up lessons when he comes back,