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问题 单项选择题

真核生物中tRNA和5SrRNA的转录由下列哪种酶催化（）

A.RNA聚合酶Ⅰ

B.反转录酶

C.RNA聚合酶Ⅱ

D.RNA聚合酶全酶

E.RNA聚合酶Ⅲ

答案

参考答案：E

完形填空
完形填空。
    Are you good at English? Would you   1   to do well in English? Well, let me   2   you a way to learn
English   3   by writing diaries (日记) in English.
    When I   4   in Grade One, my English was not very good. My English teacher Mr Xu asked me to
write diaries in English. At first, it was   5   difficult for me, but now I think it is very   6  . I like reading,
listening and speaking.   7   I often go to the Xinhua Book Store to   8   English stories for about three
hours.
    I   9   watch TV often. Now I'm very good at English. I think  10  diaries is one of the best ways to
help with your English study.
( )1. A. like       
( )2. A. talk       
(     )3. A. nice       
( )4. A. was       
( )5. A. a few      
( )6. A. difficult  
( )7. A. Always     
( )8. A. say         
( )9. A. don't     
( )10. A. saying      		B. want           
B. tell          
B. fine           
B. am             
B. a little      
B. interesting    
B. After school   
B. speak          
B. am not        
B. writing       		C. to like       
C. to talk      
C. well           
C. are           
C. few          
C. easy           
C. Sometimes    
C. talk          
C. didn't      
C. listening   		D. to want      
D. to tell      
D. good        
D. were        
D. little                               
D. boring      
D. Usually     
D. read           
D. wasn't     
D. talking    
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单项选择题

油浸纸绝缘电缆，试验电压为电缆额定电压（）倍，时间1分钟。

A.2

B.2.5

C.3
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