12._____ birds fly to the south to spend their winter every year.( 。
A.Hundreds ofB.Millions ofC.Half of

分析 每年,數(shù)以百萬(wàn)計(jì)的鳥(niǎo)飛到南方過(guò)冬.

解答 答案:B.根據(jù)題干,本句的意思是每年,數(shù)以百萬(wàn)計(jì)的鳥(niǎo)飛到南方過(guò)冬.hundreds of"數(shù)以百計(jì)的",millions of"數(shù)以百萬(wàn)計(jì)的",half of"一半的".根據(jù)常識(shí)可知,hundreds of表示的數(shù)量過(guò)少;而half of表示的數(shù)量過(guò)于精確.故選B.

點(diǎn)評(píng) 在做本題是主要應(yīng)根據(jù)常識(shí)進(jìn)行選擇,不能單純用法選擇.

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