【題目】Scientists think there has been life on Earth for _______ years.

A. millions of B. hundreds of C. five million of D. million of

【答案】A

【解析】

句意:科學(xué)家認(rèn)為地球上有生命已經(jīng)有成百萬上千萬年了。A.成百萬上千萬B.成百上千C.錯(cuò)誤選項(xiàng),應(yīng)改為five million(五百萬)D.錯(cuò)誤選項(xiàng),應(yīng)改為millions of。生命不可能只存在幾百年,排除B,故選A。

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