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问题 填空题

在S2－、Fe2＋、Fe3＋、Mg2＋、S、I－、H＋中，只有氧化性的是__________，只有还原性的是________，既有氧化性又有还原性的是________。

答案

Fe3＋、Mg2＋、H＋；S2－、I－；Fe2＋、S

完形填空
完形填空

     Recently I paid a visit to Harvard University, where there are top class scientists and professors and the
best academic system in the world.
     I was pretty _1_when I first stepped onto the campus. Well, it's not even really a campus. It's _2_like a
district in a small town.
     Harvard's main buildings are from the 18th century, They look very old and _3 . You might _4 say the
you're a little shabby. They don't fit the modern _5 of university at all. The buildings are surrounded by 6 and trees, so I felt as if I had walked into a medieval (connected with the Mid-Ages) castle. But when I
looked across the street, _7 shops and in-fashion students made me feel like I was in the 21st century _8 .
It creates a strong contrast (对比) and brings a special   9   to the school.
     Our tour 10 Gary took us around and told us. "You see this grass field in the center of the school? Here
is where they hold their _11ceremony. They just set up tents and benches (a long seat for two or more
people, especially outdoors) and have a very simple ceremony. It's   12 ! Who would think the most
talented students just graduate on the grass?
     I 13 some students put a blanket on the grass and lie down to read a book. When I listened to the soft
sound of14_turning, along with chirping of the birds, I felt very 15 . There was no competitive feeling at all.
     Harvard has the world's first computer in its science centre 16 there are hundreds of high-end (高端的)
computers, too. Its religion and the literature departments are also 17   the best. It is the perfect mix of
tradition and 18 technology. It makes Harvard a very attractive place to 19   in.
     I hope one day I'll 20 my dream school -- Harvard.

( ) 1. A. upset    
( ) 2. A. less        
( ) 3. A. grand        
( ) 4. A. even        
( ) 5. A. idea        
( ) 6. A. stones      
( ) 7. A. empty        
( ) 8. A. again        
( ) 9. A. environment  
( )10. A. partner      
( )11. A. celebration  
( )12. A. uninteresting
( )13. A. saw        
( )14. A. books      
( )15. A. lucky        
( )16. A. and          
( )17. A. in          
( )18. A. old          
( )19. A. study        
( )20. A. serve        		B. troubled      
B. more          
B. solid        
B. still        
B. way          
B. grass        
B. quiet        
B. once          
B. scene        
B. guide        
B. closing      
B. uncomfortable
B. had          
B. pages        
B. nervous      
B. but          
B. beyond        
B. fresh        
B. live          
B. find         		C. tired    
C. much      
C. simple    
C. ever      
C. model    
C. plants    
C. busy      
C. only      
C. condition
C. visitor  
C. graduation
C. unbearable
C. felt      
C. blankets  
C. calm      
C. though    
C. under    
C. fast      
C. read      
C. attend    		D. shocked      
D. most          
D. noisy        
D. yet          
D. pattern      
D. flowers      
D. free          
D. then          
D. atmosphere    
D. professor    
D. opening      
D. unbelievable  
D. imagined      
D. benches      
D. happy        
D. yet          
D. among        
D. new          
D. tour          
D. visit        
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单项选择题

下面关于ROM、RAM的叙述中，正确的是( )。

A．ROM在系统工作时既能读也能写

B．ROM芯片掉电后，存放在芯片中的内容会丢失

C．RAM是随机存取的存储器

D．RAM芯片掉电后，存放在芯片中的内容不会丢失
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