问题 多选题
在波的干涉区域里有P、Q两质点,P是波峰与波峰相遇的点,Q是波峰与波谷相遇的点,那么在以后的时间里(  )

A.P点的振幅始终大于Q点的振幅

B.P点的位移始终大于Q点的位移

C.P点的振动始终加强,Q点的振动始终减弱

D.P点的振动可能加强,Q点的振动可能减弱

答案

AC

单项选择题
阅读理解

阅读理解。

     Henry found work in a bookstore after he finished middle school. He wouldn't do anything but wanted

to get rich. Mr King thought he was too lazy and was going to send him away. Henry was afraid and had

to work hard.

     It was a cold morning. It was snowing and there was thin ice on the streets. Few people went to buy

the books and the young man had nothing to do. He hated to read, so he watched the traffic. Suddenly he saw a bag fall off a truck and it landed by the other side of the street.

     "It must be full of expensive things, "Henry said to himself. "I have to get it, or others will take it away. "

     He went out of the shop and ran across the street. A driver saw him and began to whistle(鸣笛), but he didn't hear it and went on running. The man drove aside, hit a big tree and was hurt in the accident. Two

weeks later Henry was taken to court(法庭). A judge asked if he heard the whistle when he was running

across the street. He said that something was wrong with his ears and he could hear nothing.

     "But you've heard me this time."said the judge.

     "Oh, I'm sorry. Now I can hear with one ear."

     "Cover the ear with your hand and listen to me with your deaf(聋的)one. Well, can you hear me? "

     "No, I can't. sir. "

1. What was Mr. King?     

A. a driver

B. a doctor        

C. a policeman  

D. a shopkeeper

2. Why did Mr. King want to send Henry away?    

A. Because Henry was too lazy. 

B. Because Henry hoped to be rich. 

C. Because Henry finished middle school. 

D. Because Henry sold few books.

3. The driver was afraid to _______, so he drove aside. 

A. hit Henry

B. hurt himself        

C. fall behind

D. lose the bag

4. What does the underlined word"judge"mean in Chinese?

A. 裁判    

B. 律师            

C. 法官    

D. 原告

5. Why did Henry say that he was deaf?

A. He wanted to have a joke with the judge. 

B. He wanted to get the judge's help

C. He wanted to find another piece of work

D. He didn't want to pay for the accident.