问题 问答题

一个物体受到竖直向上的拉力F=650N,由静止开始向上运动.物体在最初2s内的位移为6m,求物体的质量是多少?(g=10m/s2

答案

物体匀加速上升,由运动学公式,得到:x=

1
2
at2

解得:a=

2x
t2
=3m/s2

物体受拉力F和重力G的作用,由牛顿第二定律有:

F-mg=ma

解得物体的质量为:m=50kg;

答:物体的质量是50kg.

完形填空

阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意问题后的词数要求)。

(1) Everybody has to buy or sell things sometimes.Even students who are usually not very rich, have

to learn something about making purchases intelligently.As a student, you may find, for example, that

you need to buy a walkman or winter clothing.You may want to buy a television or a used car.Of course,

you want to get good value for your money.If you are considering a major purchase, or any purchase you

should remember several important things.

(2) Study first, and then decide what to buy.You can get enough information just by reading books

and advertisements.

(3) Remember that a high quality product will probably last longer and work better.Of course, for a

superior product you ______________.An inferior product may not give you the same quality,

but the price could be low.A poor quality product could be expensive and a valuable one could be on sale

at a greatly reduced price.

(4) Don't worry.Take your time.After you decide what product you want to buy, go to many

different stores.If you cannot find the product you want, you try to order it directly from the factory or

ask the store to order it for you.

(5) Look for a good deal.If you wait, you may probably find that your product will go on sale and

you may be able to save 10,20, or even 50 percent of the original price.

(6) Finally, before you buy, make sure that that product is guaranteed.If you find the lowest possible

price, you will generally be happy with your purchase and also keep more money in the bank.

小题1:What is the main idea of the passage? (no more than 8 words)

小题2:What should you care more while shopping? (no more than 5 words)

小题3:Fill in the blank in Paragraph 3 with proper words.(no more than 5 words)

Of course, for a superior product you

小题4:How can you get good value for your money? (list at least two things) (no more than 20 words)

小题5:What does‘the underlined’word“one"’refer to in paragraph 3?

单项选择题