单项选择题

Questions 20 to 22 are based on the conversation you have just heard.

A. Survival strategies for extreme Antarctic cold.
B. Why inactive volcanoes become active.
C. The principal causes of global warming.
D. The effects of volcanoes on the Antarctic ice sheet.

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单项选择题
A. To encourage people to participate in a club activity.B. To introduce a new kind of bicycle.C. To inform bicycle beginners about New Jersey’s traffic laws.D. To warn tourists about bicycling on the roadways.

A. To encourage people to participate in a club activity.
B. To introduce a new kind of bicycle.
C. To inform bicycle beginners about New Jersey’s traffic laws.
D. To warn tourists about bicycling on the roadways.
填空题
36（）
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