单项选择题

Questions 8 to 11 are based on the conversation you have just heard.

A．When fishing in the center of the lake.
B．When canoeing on the lake.
C．When swimming in the lake.
D．When cutting trees on the edge of the lake.
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单项选择题
A．Because the world is becoming more and more noisy.B．Because they have learned that noise is also a kind of pollution.C．Because noise is an unwanted waste for human beings.D．Because people knew little about noise before.
A．Because the world is becoming more and more noisy.
B．Because they have learned that noise is also a kind of pollution.
C．Because noise is an unwanted waste for human beings.
D．Because people knew little about noise before.
单项选择题
A．The captain.B．The communications officer.C．The doctor.D．The frog people.
A．The captain.
B．The communications officer.
C．The doctor.
D．The frog people.
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