2．如图17所示，将质量M=1.20 kg的小沙箱，用轻质软绳（不可伸长）悬挂起来，开始处于静止状态，绳的长度l=0.80 m。用枪向沙箱发射质量m=0.05 kg的子弹，子弹以v₀=100 m/s 的速度向右水平击中小沙箱，并留在小砂箱中，小沙箱沿竖直面向上摆动。假设沙箱每次向左运动到最低点时就恰好有一颗同样速度的子弹射入沙箱，子弹射入沙箱的过程时间极短，可忽略不计，重力加速度g取10 m/s²，不计空气阻力。

   （1）求第一颗子弹射入沙箱的过程中子弹对砂箱的冲量大小；

   （2）求第一颗子弹射入沙箱并相对沙箱静止的瞬间，求砂箱对绳的拉力的大小；

   （3）求第一颗子弹射入沙箱后，砂箱摆动的最大高度；

   （4）要使沙箱摆动的最大角度小于60°，射入沙箱的子弹数目至少为多少

第三节短文改错(共l0小题；每小题l．5分，满分l5分)
此题要求改正所给短文中的错误。对标有题号的每一行做出判断：妞无错误，在该
行右边横线上画一个勾(、／)；如有错误(每行只有一个错误)，则按下列情况改正：
此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺—个词：在缺词处加一个漏字符号(^)，在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
I just come back from Britain last week．I Was         76._______
luckily enough to be one of the students from many          77. ________   
different country to visit the UK from Feb．16 to 28．       78. ___________   
We paid a visit to a good many of places，like London，     79. _________      
0xford or the Lake District．I learned much about British     80. _________     
culture and history in London， where was my favorite．     81._________     
I also liked Oxford, in which I saw much more old buildings．  82. ________            
The Lake District was beautiful，but it was pity that it         83.__________          
rained heavily when we were there．The most excited thing    84._________           
for me in Britain was that I made a lot of friends there．        85. _________

完成句子（共5小题, 每小题4分, 每空1分,共20分）请根据中文句子含义，把对应的英语句子的空缺部分补充完整,每空填一词。

1. 这是珍妮第一次患上这种奇怪的病.

It is the first time ______ Jenny _____ ________ ______ such a strange disease.

2. 这两个决定中,哪一个决定在你的生命中起了更为重要的作用, 是前者还是后者?

Which of the two decisions has _______ a more important ______ in your life, the former one or the _____ ________?

3. 我的侄子很固执. 一旦他决定想做什么, 没有人能改变他的想法。

My nephew is a very stubborn boy. ________ he has determined to do something, no one can _______ _______ ________.

4. 他看起来似乎不在乎你的表扬, 但是他其实是很看重的.

It seems ______ ________he didn’t _______ _____ your praise, but as a matter of fact, he thinks highly of it.

5. 只有当我们全心投入我们的学习时,我们才能实现自己的梦想.

_______ when we devote ourselves fully to study will we be able to _______ ______ _________.

读写任务(共l小题，满分25分)

    阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

    The following story took place long ago in Israel. One day when government officials were using smoke to force the mice inside a hole to come out, they saw two mice, after all the others escaped, squeezing slowly out at the exit of the hole. The strange thing was that after they came out, they did not run away immediately. Instead, one chased after the other near the exit of the hole. It seemed that one was trying to bite the tail of the other.

    Everyone was puzzled, so they stepped closer to take a look. They realized that one of the mice was blind and could not see anything, and the other one was trying to allow the blind mouse to bite on his tail so he could pull the blind one with him to escape.

     After witnessing what happened, everyone was speechless and lost in thought. Then, one serious Rome official said: “I think the relationship between those two mice was that of emperor and minister.”  A smart Israeli said: “I think husband and wife.” A Chinese, who was accustomed to the firm tradition of loyalty to parents, said: “I think mother and son.” And a pure Samaritan said......

【写作内容】

1、以约30个词概括这段短文的内容。

2、然后以约120词就这个主题发表看法，并包括以下要点：

   1）你认为这两只老鼠最有可能是什么关系，为什么？

2） 以你或他人的亲身经历说明你的体会。

【写作要求】

你可以使用实例或其他论述方法支持你的论点，也可以参照阅读材料中的内容，但不得直接引用原文的句子；

【评分标准】                              

    概括准确，语言规范，内容合适，篇章连贯。

阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词。

Whenever we meet with difficulty or failure, teachers, parents or others often say to us or perhaps we say to ourselves, “Never give up.” These can be encouraging words and words of determination. A person who believes in himself will keep trying to reach his goal no matter how many times he fails. In my opinion , the quality of determination to succeed is an important one to have. Therefore, I believe that we should never give up.

One reason is that if we give up too easily, we will rarely achieve anything. It is not unusual for us to fail in our first attempt at something new, so we should not feel disappointed and should try again. Besides, if we always give up when we fail , we will not be able to develop new skills and grow.

Another reason we should never give up is that we can learn from our mistakes so that we can not make the same ones. If we do not try again, the lesson we have learned is wasted.

Finally, we should never give up because as we work to reach our goals, we develop confidence, and this confidence can help us succeed in other areas of our lives. If we never challenge ourselves, we will begin to doubt our abilities.

In short, it is important that we do not give up when working for our goals. Whether we succeed in the end or not , we will learn something , and what we learn will help us to become better and more confident. Furthermore, if we give up , we have no chance of attaining our goals any more , but if we keep making great efforts, there is always a chance that we will succeed one day.

Topic: Never Give UP