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问题 单项选择题

脓胸的致病菌多来自（）。

A.肺部感染

B.纵隔感染

C.支气管炎

D.膈下脓肿

E.败血症

答案

参考答案：A

完形填空
完形填空。
     Many of you are studying English and you may be (1)_______ why it is so difficult to learn. It's actually
not too difficult to learn (2)______ you know some (3)_______ about the language and culture that it reflects
(反映). Perhaps the first thing you need to know about English is that it is made up of several other languages
(4)_______ French, German, Latin, Greek and Anglo-Saxon. In addition, there are words (5)_______ Spanish
in English and many American Indian words and names, even some Chinese and Japanese (6)_______ can be
found in the English language. This borrowing of words (7)             other languages is (8)_______ of the key
reasons (9)______ there are some difficulties that people meet with (10)             they are learning English.

( )1. A. knowing   
(     )2. A. but      
(     )3. A. news    
(     )4. A. such as
(     )5. A. in        
(     )6. A. words     
(     )7. A. for       
(     )8. A. that      
(     )9. A. why       
(     )10.A. when       

B. wondering     
B. and           
B. facts          
B. the same as  
B. off           
B. culture        
B. to            
B. something    
B. of            
B. before        		C. learning    
C. if          
C. truth        
C. so as     
C. of          
C. language     
C. from        
C. one      
C. what       
C. after       		 D. hearing            
D. unless              
D. information          
D. for example                            
D. from                
D. letters           
D. out                 
D. this              
D. for                 
D. while            
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选择题

已知分子式为C4H8Cl2的链状有机物，其含有一个甲基的同分异构体共有（不考虑顺反异构）[ ]

A.4种

B.5种

C.6种

D.7种

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