问题 单项选择题

《煤矿安全规程》规定,局部通风机及其开关地点附近10m以内风流中,瓦斯浓度不超过()时,方可人工开启局部通风机。

A.0.5%

B.1.O%

C.1.5%

D.2.0%

答案

参考答案:A

完形填空
完形填空。
    Collectors (收藏家) know just what to look for in a comic book. They always check the   1   first. They like
to find the books that came out between 1938 and 1945. These years   2   the Golden Age of comic books. Now
these books are very   3  . The first copy (册) of Marvel Comics cost a little money   4   it came out. Now it is
worth more than $100,000. 
    Collectors also look for the books in which a character   5   for the first time. The first Superman story tells
how Superman came to Earth. This comic book might cost as much as $125,000.   6   a character from one
comic book turns up in another one. When Batman (蝙蝠侠) is   7   in a Superman comic, the price of the book
goes up. These books are called crossover books. They are worth more because there are not   8   of them. 
    Don't let the high prices   9   you from starting a collection of your own. Comic books that came out after the
Golden Age don't cost so much. Today's comic books are even  10  . You can enjoy them now and save them for
their future value.
( ) 1. A. place    
( ) 2. A. followed  
( ) 3. A. expensive 
( ) 4. A. when      
( ) 5. A. appears  
( ) 6. A. Suddenly  
( ) 7. A. lost      
( ) 8. A. any      
( ) 9. A. keep      
( ) 10. A. better    
B. date      
B. reached  
B. cheap    
B. if        
B. travels          
B. Luckily  
B. wanted    
B. some      
B. make      
B. cheaper 
C. size      
C. marked    
C. high      
C. before    
C. acts      
C. Actually        
C. shown    
C. all      
C. leave    
C. more    
D. price       
D. divided     
D. low         
D. while     
D. fails       
D. Sometimes   
D. protected   
D. many        
D. have      
D. thicker   
单项选择题