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问题 单项选择题

能够避免声速变化而引起测量误差的水声导航仪器是（）。

A．多普勒计程仪

B．声相关计程仪

C．回声测深仪

D．A、B、C均是

答案

参考答案：B

选择题

The author was required to submit an _____ of about 200 words together with his research paper.[ ]

A. edition  

B. editorial

C. article  

D. abstract
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补全对话，情景问答
Read and match. 给下列问句选择合适的答语。
( ) 1. Are you having fun?                                     
( ) 2. Would you like some rice?                               
( ) 3. What do you want to do?                                 
( ) 4. Where are you going?                                    
( ) 5. What is Tom going to do?                                
( ) 6. What time is it?           		A. I want to take a picture.                             
B. Yes, I'm having fun.                                  
C. No, thanks.                                           
D. He is going to swim.                                  
E. I'm going to the park.                                
F. It's 3:00.               
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