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

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(1) effect of the country’’s growing human population on its wildlife(2) possible reason for the effect(3) your suggestion for wildlife protection
单项选择题
The first paragraph shows that
A． the Administration has ignored the public anxiety about acid rain.
B． the industrial sulfur emissions need further scientific verification
C．the spokesmen have denied the presence of proofs of acid rain.
D．scientific evidence has made the cause of acid rain undebatable.
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