题目内容

请听下面一段材料,  回答第1至3题。
1. What will be discussed at the conference?
A. Water pollution.    
B. Food pollution.      
C. Air pollution.
2. How long will the conference last?
A. One month.        
B. A fortnight.            
C. Seven days.
3. What is the man?
A. A scientist.        
B. A writer.            
C. A traveler.
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