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问题 单项选择题

聚合物驱注入液浓度井口取样每月（）次，两次间隔时间在10d以上。

A、1

B、2

C、3

D、5

答案

参考答案：B

完形填空
完形填空。
Dear Linda,
    Thanks   _1_ your letter. I'm glad   2   you can come _ 3   Sunday. When you drive over to my house,
it's easy   4_ _the station. It's a little difficult after that.
     So here    5    some instructions (说明) :Drive past the station. You can't   6_   left into Garden Road,
so go  _ 7   the traffic lights into NewStreet.  _8 _ a football ground   9 _ your left. Go straight ahead,
pass the bank, and turn left into Green Road. Turn   10 _again into the High Street, River Street is on the
right.
     My house is on the right, across from the  school.
     See you on Sunday !
                                                                                                                                    Love ,
                                                                                                                                     Ann
( )1. A. from      
( )2. A. to hear    
( )3. A. from      
( )4. A. to look for
( )5. A. are        
( )6. A. taking    
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( )8. A. There is  
( )9. A. on        
( )10. A. the left  		B. for        
B. hear      
B. a          
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B. be        
B. turn      
B. down      
B. There have
B. in        
B. the right  		C. with          
C. to listen to  
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C. look for      
C. am            
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C. There are      
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D. listen    
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D. find      
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选择题

有A，B，C三种物质各15g，在一定条件下充分反应只生成30gD，若增加10gC，A恰好完全反应．A的相对分子质量为n，B为2n，则A与B的化学计量数之比为（　　）

A．3：2

B．2：3

C．1：2

D．3：1
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