听对话,回答问题。1. Listening to English for ______ at one..

题目内容:
听对话,回答问题。
1. Listening to English for ______ at one time is good for you.
A. an hour    
B. half an hour    
C. five minutes
2. What kind of listening material is better for practising?
A. Interesting and not difficult.
B. Easy and long.
C. Interesting and difficult.
3. To choose the tape on which the people speak______ is a good choice for practising listening.
A. quickly     
B. clearly, not too fast    
C. badly
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