Frank is very lonely, he has few friends, ______?
A. does he               B. doesn’t he                   C. is he
A解析:
應先把820億元整理為用元表示的數(shù),科學記數(shù)法的一般形式為:a×10n,在本題中a為8.2,10的指數(shù)為整數(shù)數(shù)位減1.820億="82" 000 000 000=8.2×1010
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