问题 填空题

我国公元前2世纪就有人用冰透镜取火,这利用了凸透镜对太阳光的______作用.渔民可以利用电子发声器把鱼吸引到网里,表明______.

答案

(1)让太阳光通过凸透镜,光线会聚焦点,从而使热量集中到焦点上.如果在焦点处放些易燃物质,易燃品就会燃烧起来,从而取火,正是利用了凸透镜的会聚作用.

(2)渔民可以利用电子发声器把鱼儿吸引到网里面来,表明水能够传播声音.

故答案为:会聚;水能够传播声音.

完形填空
完形填空。
     In today's world many people seem to be hungry for money. Some of them even lost their lives for it. 
  1  does have its most useful effect on the poor. But if a person has a rich life, a lot more money doesn't
mean  2  happiness.
    If money were everything, all  3  people would have true love, real friendship, health and long life.   
 4 , this is not always true.
    Nothing else is more pleasant  5  the three words "I love you". But can love be bought? I'm afraid not.
Love means "give", not "take".   6  and a long life are probably the most expensive things for every   7 .
Well, can health and a long life be bought with money? The answer is "No". Of all the people  8  live
longest in the world, few of them are millionaires. Real friendship can't be bought , either.
    In a word, where money is worshiped, money can make  9  argue , lovers hate , and strangers fight
with each other and so on. No matter  10  money you have, it is still not enough to make you a happy
person if you have no one to laugh with and no one to cry for.
( )1. A. Money      
( )2. A. some      
( )3. A. poor      
( )4. A. But        
( )5. A. to        
( )6. A. Health    
( )7. A. child      
( )8. A. what      
( )9. A. teachers  
( )10. A. how many  
B. Love      
B. many      
B. happy    
B. Then      
B. than      
B. Healthy  
B. man      
B. which    
B. birds    
B. how much  
C. Time    
C. more    
C. lucky    
C. However  
C. from    
C. Happy    
C. person  
C. who      
C. brothers
C. how often
D. Friendship
D. a little  
D. rich      
D. So        
D. with      
D. Happiness                           
D. woman    
D. whom      
D. students  
D. how long  
单项选择题