试题与答案

我国水资源开发利用存在的主要问题?

题型:问答题 简答题

题目:

我国水资源开发利用存在的主要问题?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:DNA复制需要细胞提供的能量,故A正确。RNA可以做为模板在逆转录酶的作用下合成DNA,故B正确。真核生物的DNA是主要是在细胞核,转录形成的RNA也是在细胞核,故C正确。DNA的复制发生在有丝分裂间...

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题型:完形填空
完形填空。
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in a big city and he moves (搬到) there  3  his family.
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     After lunch, Jimmy and his mother go to the park. Jimmy wants  8  near the pool, but there is a
sign (标牌) in front of it. His mother reads it to him. "Warning (注意), this pool is dangerous (危险),
367 people have fallen into it (已掉入)." "Jimmy looks into the pool  9  and he says," But I can't  10  
them."
( )1. A. lives    
( )2. A. plays  
( )3. A. and    
( )4. A. isn't    
( )5. A. near here
( )6. A. on      
( )7. A. is going  
( )8. A. to walk  
( )9. A. care    
( )10. A. look  
B. living    
B. playing  
B. or        
B. doesn't  
B. ne ar to here
B. in         
B. are going  
B. walk       
B. careful    
B. see        
C. live    
C. play    
C. with    
C. is      
C. here near  
C. at      
C. go        
C. walking  
C. carefully  
C. look for  
D. to live    
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D. to          
D. not        
D. here to near
D. for        
D. goes                                
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