问题 计算题

一个质点从静止开始做匀加速直线运动。已知它在第1秒内的位移是2m。求:

(1)质点运动的加速度;

(2)它前进72m所用的时间。

答案

解:(1)设物体的加速度为a

,可知:

解得:物体的加速度a=4m/s2

(2)由公式,可知:

所以物体从开始到前进72m所用的时间t=6s

完形填空

.

第二节(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Computers are very important to modern life. Many people think that in the future computers will be used in lots of everyday life. ___66____ There will be no more books because we will be able to get all texts from computers. The Internet will be used to play games, see films and buy food. Most telephone calls will be made by computers, too.

____67___ Others do not think that computers will replace our old way.

Let’s look at books, for example. Some people think that one day we will not read books made of paper. ____68____ We will read texts on small pocket computers. The computers will keep many different books in them at the same time. Lots of pages and paper will be saved. Computerized books will be used more and more.

____69____ Many people say it is not. It is a pleasure to go into shops and look at things you want to buy. It is also unlikely that many people will want to read large texts on our computers. ____70____

A.Is Internet shopping such a pleasure as going to the shop?

B.Instead, we will buy and read books using computers.

C.Because paper books will perhaps be more friendly. Maybe computers won’t change these two habits.

D.some people are glad about those new ways of shopping and communicating.E. Maybe we will use computers more and more often in our daily life.

F. It is thought that we won’t have to go shopping because we will be able to get most things which are sold in shops on the Internet.

G. People can’t live without computers in the future.

单项选择题