【題目】Between 1950 and 1990, the world population doubled to 5.3 . Nearly eighty

of these people live in developing, poorer nations.

A. billion; per cent B. billion; percentage

C. billions; percentage D. billions; per cent

【答案】A

【解析】句意：在1950到1990年間，世界人口數(shù)量加倍增長到53億，將近80%的人生活在發(fā)展中、更加貧窮的國家。billion十億，數(shù)詞，跟基數(shù)詞搭配時，不用復(fù)數(shù)形式，故C和D不對；percent百分?jǐn)?shù)，沒有復(fù)數(shù)形式；percentage是名詞，百分比，百分率。eighty percent表示80%，故應(yīng)選A。

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