题目内容

Frank is very lonely, he has few friends, ______?
A. does he               B. doesn’t he                   C. is he
A解析:
应先把820亿元整理为用元表示的数，科学记数法的一般形式为：a×10n，在本题中a为8.2，10的指数为整数数位减1．820亿="82" 000 000 000=8.2×1010．
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New Rules and Behavior Standards(行为规范) for middle school students has come out.
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