问题 选择题

一只重500N的箱子放在水平地面上,甲学生用100N的水平力将箱子水平移动10m,乙学生把这只箱子匀速提高2m,那么,他们做功的大小是(  )

A.相等

B.甲学生做功多

C.乙学生做功多

D.条件不够,无法确定

答案

甲同学做功:

W=Fs=100N×10m=1000J;

乙同学做功:

W=Gh=500N×2m=1000J;

∴W=W

故选A.

阅读理解

Fangfang, a 15-year-old Chinese girl, likes eating snacks very much. She prefers cream biscuits, McDonald’s food, KFC, and Beijing roast duck. Sometimes she eats two packages of biscuits a day. As a result, she becomes overweight.

Today in China, there are many children like Fangfang. They like snacks. They don’t eat enough healthy foods like vegetables and fruit. It’s very bad for their health. Poor eating habits are a serious problem.

Health experts say that children should have healthy eating habits. First, they must eat regular meals and begin with a good breakfast. Second, they should have different kinds of foods, such as fruit, vegetables, grain, eggs, milk and meat and so on. Third, the children shouldn’t eat too many snacks and fried foods. They are delicious, but eating too much of them is unhealthy.

If children do as the experts say, they won’t become fat. They will be healthier. Students won’t become tired at school, and they will have enough energy to study well.

小题1:What does the underlined word “overweight” mean?

A.聪明的

B.懒惰的

C.超重的

D.痴呆的小题2:Fangfang becomes overweight, because _____.

A.she is an American girl

B.she has a balanced diet

C.she likes eating snacks

D.she likes vegetables soup小题3:What kind of food is good for your health?

A.Fast food.

B.Snacks.

C.Fried food.

D.Vegetables and fruit.小题4:If students do as the experts say, they will ______.

A.become fatter and fatter

B.become more and more beautiful

C.have enough energy to study

D.be healthier and more tired小题5:Which of the following is True?

A.Eating snacks is good for your health.

B.Fangfang doesn’t like Beijng roast duck.

C.Fangfang comes from America.

D.Students shouldn’t eat too much fried food.

判断题