题目内容

听下面一段材料,回答第1至3小题。
1. Why do they collect the rubbish along the river?
A. To stop the fiver from being polluted.
B. To sell it for money.
C. To see the river every day. 
2. How many volunteers do they have?
A. 12.
B. 16.
C. 28.
3. When do they do the volunteer work?
A. At 7:30 every morning.
B. After lunch at noon.
C. After dinner every evening.
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