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【参考答案】

Dear Professor，　　I’m writing to you to request a letter of ......

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单项选择题
What used to be the danger in being a man according to the first paragraph
A．A lack of mates.
B．A fierce competition.
C．A lower survival rate.
D．A defective gene.
单项选择题
The writer warns Americans that
A． their excessive consumption has caused world resource exhaustion.
B． they are confronted with the problem of how to obtain more goods.
C． their unfair share of resources should give way to proper division.
D． they have to discard their cars for the growing scarcity of oil fuels.
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