Water pollution can't affect nature's balance in oceans, rakes and rivers.
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W: Why do you always wait till the last minute？
Q: What does the woman mean？
(18)
A. She thinks it's too late anyway.
B. She thinks he shouldn' t wait a minute.
C. She thinks he should do things earlier.
D. She thinks there might still be a chance even if it is the last minute.
night.
M: If I had known this I wouldn' t have troubled him so much.
Q: What do we learn from the conversation？
(19)
A. The man took up much of the professor's time.
B. The man didn't make any trouble with Prof. Johnston.
C. The man has trouble getting along with Prof. Johnston.
D. The man knew Prof. Johnston was very busy.
听力原文：W: I'm going to the stationary store for some pencils. Want anything？
M: See if you can pick up a stapler for me.
Q: What does the man mean？
(16)
A. He wants her to pick up some stamps.
B. He wants her to buy some tables.
C. He wants her to buy a stapler.
D. He wants her to buy some pencils.
听力原文：W: Let's go and watch the match in the TV room. It's the final and ! can't miss it.
M: I have two tickets. Wouldn't it be better to watch it live？
Q: What does the man suggest？
(17)
A. To go to watch the final in the TV room.
B. To go to see a movie since he has two tickets.
C. To go to see the final live since he has two tickets.
D. To go to see the concert live since he has two tickets.
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