单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．18.
B．22.
C．12.
D．35.
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单项选择题
A．Planting crops.B．Clearing new land.C．Building houses.D．Caring for animals.
A．Planting crops.
B．Clearing new land.
C．Building houses.
D．Caring for animals.
单项选择题
A．A community of plants.B．A community of animals.C．The study and understanding of plants and animals.D．The interacting physical factors of the environment.
A．A community of plants.
B．A community of animals.
C．The study and understanding of plants and animals.
D．The interacting physical factors of the environment.
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