问题 单项选择题

物体做直线运动,关于速度与加速度关系,下列说法中正确的是()

A.加速度增大时,速度一定增大

B.物体有加速度,速度可能不变

C.物体速度很大,加速度可能为零

D.物体速度为零,加速度一定为零

答案

参考答案:C

解析:做直线运动的物体,如果速度和加速度反向,当加速度增大时,速度减小,选项A错误;物体有加速度,速度一定改变;选项B错误;物体速度很大,加速度可能为零,选项A正确;物体速度为零,但是加速度不一定为零,选项D错误;故选C

完形填空

When people find something valuable and return it to its owner, they are often given a reward. This is because the person not only found what was lost but also spent time   46  its owner or taking it to the police station.

There was once a young boy   47  found a woman’s purse in a shopping centre. Inside the purse there   48  some money and the woman’s driving license. Her name and   49  were printed on the license, so the boy knew where she lived. That evening he went to her house and   50  her door. When she opened it, he said, “ I found your purse,” and handed it to her.

“Thank you very much,” she said. She opened her purse and took out all the money. She wanted to give the boy a small reward,   51  there were only bills of $20 in the purse and she thought that $ 20 was too   52  to give the boy. “ I’m sorry,” she said, “ but I don’t have any small    53  to give you.”

The boy said, “That’s all right,” and he went away.

A few days later he found   54  woman’s purse. It also had her driving license in it, so he knew where she lived. He went to her house and said “ I found your purse,” and handed it to her.

“Thank you very much, “ she said. She opened her purse and took out all her money.

“That’s   55   ” , she said, “ Before I lost my purse I had a $100 bill and a $20 bill in it. Now I have a $100 bill, a $10 bill and two $5 bills.”

“Yes,” the boy said, and smiled.

小题1:A. to find                                    B. finding                       C. find

小题2: A. who                                         B. whose                               C. which

小题3:A. is                                               B. were                                    C. was

小题4:A. e-mail                                       B. address                            C.age

小题5:A.cut down                                        B. knocked on                         C. broke into

小题6:A. so                                             B. but                                         C. or

小题7:A. little                                          B. few                                       C. much

小题8:A. change                                         B. menu                                        C. purse

小题9:A .another                                         B. the other                                 C. other

小题10:A interesting                                    B. exciting                               C. strange

选择题