如图所示，竖直平面内的3/4圆弧形光滑轨道半径为R，A端与圆心O等高，AD为与水平方向成45°角的斜面，B端在O的正上方，一个可看成质点的小球在A点正上方由静止开始释放，自由下落至A点后进入圆形轨道并恰能到达B点。求：

（1）到达B点的速度大小；

（2）释放点距A点的竖直高度；

（3）小球落到斜面上C点时的速度大小。

完形填空（共20小题，每小题1.5分，满分30分）

阅读下面短文，从短文后所给各题的四个选项（A、B、C、D）中，选出最佳选项，并在答题卡上将该项涂黑。

Recent studies have shown that children with learning disabilities (LD) often have problems. For many, strong  21 of anger, shame, sadness, or disappointment can 22 psychological difficulties such as anxiety, depression or low self-esteem. These problems can be far more than the  23 challenges themselves.

Several heading experts in the field of LD have offered suggestions on ways to help 24 children from these problems.

To be most effective in supporting 25 , it can help to understand some primary  26  for the psychological and emotional challenges they may face.

First, it is not difficult to see  27  children with LD are at greater risk for developing psychological difficulties if one considers the repeated failure they 28 . Although they make efforts to “try harder,” children with LD may receive little  29  feedback（反馈）. Their academic struggles and failures are often met with 30 by teachers, peers and parents. Such disapproval can take the form of unpleasant labeling（标签）of a child 31“slow,” “lazy” or “dumb.” 32 developing a sense of pride in their accomplishments, children with LD may  33  in disappointment and shame. Low self-esteem and a lack of confidence only  34 prevent learning and academic success.

The second reason is the 35 difficulties they often experience. Research indicates that as many as 75% of kids with LD have such 36 as making and keeping friends. Children with LD are less 37 and often rejected by their peers. Teachers and other adults also may  38 to have negative views of them. Such social rejection(排斥)can result in  39 of self-esteem and feelings of loneliness, which,   40   may lead to psychological difficulties such as anxiety and depression.

1.A. opinions        B. feelings       C. ideas           D. attitudes

2. A. cause          B. get             C. solve           D. overcome

3. A. mental          B. physical        C. potential        D. academic

4. A. protect         B. prevent         C. remove          D. separate

5. A. experts       B. children         C. teachers         D. parents    

6. A. ways          B. rules          C. reasons           D. directions

7.A. where         B. why            C. which             D. when

8. A. practise      B. experience        C. possess          D. find

9. A. hopeful        B. timely          C. subjective        D. positive

10.A. sympathy     B. courage         C. disapproval        D. respect

11.A. as             B. for               C. with               D. to

12.A. Instead of     B. In favor of     C. Because of       D. In terms of

13. A. turn away     B. work out      C. break off         D. end up

14. A. hardly          B. further          C. even              D. slightly

15. A. general         B. social           C. personal           D. cultural

16. A. values           B. mistakes       C. chances           D. difficulties

17.A. requested      B. controlled     C. admitted         D. accepted

18.A. mean           B. tend           C. prefer             D. pretend

19. A. pride           B. need         C. loss               D. awareness

20. A. in particular      B. in general     C. in total          D. in turn

如图所示，竖直平面内的3/4圆弧形光滑轨道半径为R，A端与圆心O等高，AD为与水平方向成45°角的斜面，B端在O的正上方，一个可看成质点的小球在A点正上方由静止开始释放，自由下落至A点后进入圆形轨道并恰能到达B点。求：

（1）到达B点的速度大小；

（2）释放点距A点的竖直高度；

（3）小球落到斜面上C点时的速度大小。

  假如你叫李华，是一位高中生。随着科技的发展，iPod 已成为中学生的新宠。用iPod既可听音乐，阅读纯文本电子书，又可玩电子游戏。请你用英语给某报社写一封信，谈谈中学生使用iPod的情况。信的内容须包括以下几点：
1.  使用iPod对学习的好处；
2.  对课堂纪律和学习可能产生的负面影响；
3.  提出自己的建议并说明理由。
注意：1. 词数：100左右  
2. 信的开头和结尾已给出，不计入总词数。
Dear Editor ,
I’m a senior high school student , named Li Hua .________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
____________________________________________________………
Yours sincerely ,
LiHua

快餐现在在中国很流行，人们尤其儿童和青少年喜欢吃快餐。现在你们班就快餐(Fast Food)展开了一场讨论，有的赞成，有的反对，请你根据讨论结果， 写一篇短文，介绍讨论情况并发表个人看法。 

注意：词数100左右。(开头不计入词数)

参考词汇：  节约 save  纤维 fibre

开头已写好，请接着写。

   Fast food is becoming more and more popular in China, especially among children and teenagers. Recently our class has held a discussion on fast food. Different students have different opinions.