What percentage of the earth's water can man actually use at present?
A.Nearly 75 per cent B.About 97 per cent C.Exactly 3 per cent D.Less than 3 per cent
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答案解析:
The word "affect" in Paragraph 6 could be best replaced by(
The word "affect" in Paragraph 6 could be best replaced by( )A."influence" B."e