问题 选择题

有机合成材料的出现是材料发展史的重大突破。下列应用的材料属于合成材料的是

A.隔水透气的鸟笼

B.人面鱼纹彩陶盆

C.大理石华表

D.银制器皿

答案

答案:A

题目分析:根据有机合成材料的概念分析,有机合成材料首先必须是有机物。

A、隔水透气的鸟笼是用聚硅氧烷薄膜制造的塑料制品,属合成材料,正确;

B、人面鱼纹彩陶盆属于无机材料,错误;

C、大理石华表的主要成分是碳酸钙,属于无机物,错误;

D、银制器皿属于金属材料制成,错误。故选A

点评:理解和熟记合成材料的概念以及与之相关的知识,是解答本题的关键;有机合成材料主要包括塑料、合成纤维、合成橡胶三大类。

完形填空
完形填空。
     Swimming is very popular in summer. People like swimming in summer because water makes
them   1   cool. If you like swimming, but swim in a  2   place, it may not be safe. These
years, more than ten people   3   while they were enjoying themselves in the water and   4  
of them were students. But some people are   5    not careful in swimming. They often think
they swim so  6   that nothing can happen to them in water. Summer is here again. If you go
swimming in summer, don't forget   7   some people died in water. They died because they were
not careful, not because they  8  swim. So don't get into water when you are alone.   9  
there is a "No Swimming"sign, don't get into water,   10  . If you remember these, swimming
will be safer.
( )1. A. felt    
( )2. A. different
( )3. A. died    
( )4. A. much    
( )5. A. yet      
( )6. A. fast    
( )7. A. what    
( )8. A. mustn't
( )9. A. Because  
( )10. A. either  
B. feel    
B. small    
B. die      
B. most    
B. already  
B. often    
B. that    
B. wouldn't
B. Though  
B. nor      
C. feeling  
C. right    
C. have died
C. lot      
C. still    
C. well    
C. which    
C. needn't
C. Whether  
C. also    
D. to feel    
D. wrong      
D. will die  
D. more      
D. even      
D. hard      
D. why                        
D. couldn't
D. If        
D. too        
单项选择题