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/B【解析】用力F1拉物体时，因为物体沿斜面匀速运动，故有F1=mgsin 0+umgcos 0,F1v1=Po。当用力F2拉物体时，因为物体也沿斜面匀速运动，有F2cosa=ngsin 0+u(ngcos 0一Fsin a),FFa t cos a-P。联立以上各式，可得Fz一cosa usin a’飞一(1十a,由题中条件不能确定F1和F2的大小关系，但可以确定v<v2,故B、C项正确。

Many facts suggest that children are overweight and the situation is getting worse, according to the doctors. 1. .

Some people blame(责备) the fact that we are surrounded (包围) by shops selling unhealthy, fatty foods, such as fried chicken and ice cream, at low prices. 2. , then probably children would buy less take-away food.

3. . I agree with this, because good eating habits begin early in life, long before children start to visit fast food shops. If parents often give their children fried chicken and chocolate rather than healthy food, they will go for sweet and salty foods, and children will find it hard to get rid of the habit.

There is a third reason for this situation. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games. 4. . What they need is to go outside and play active games or sports.

The above are the main reasons for this problem. 5. , as well as forcing them away from fast food shops and bad eating habits.

A. There is another argument that blames parents for allowing their children to become overweight

B. Adults are becoming fatter and unhealthier too

C. If there were fewer of these restaurants

D. Therefore we have to encourage young people to be more active

E. Not only is this an unhealthy pastime(消遣), it also gives them time to eat more unhealthy food

F. I feel there are a number of reasons for this

G. It’s a good idea to allow children to eat what they choose

试题答案

1.F

2.C

3.A

4.E

5.D

【解析】

试题分析：本文写了当代大人和孩子们的通病，吃垃圾食品，肥胖等不良习惯，并且呼吁人们多运动，远离坏习惯。

1.

2.

3.文If parents often give their children fried chicken and chocolate rather than healthy food, they will go for sweet and salty foods,and children will find it hard to get rid of the habit.如果大人们给他们的孩子吃这些，孩子们很难摆脱这个习惯，因为后文提到大人也不注意这些，所以此处应选A。

4.

5.

考点：考查生活知识类短文阅读

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