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18．It is reported that Americans eat too much protein every day，_______ as they actually need．（　�。�
A．twice as muchB．as twice muchC．much as twiceD．as much twice

分析 據(jù)報道美國人每天吃太多的蛋白質，是他們實際需要的兩倍．

解答 答案：A 句意表達的是倍數(shù)；英語中as…as…表示倍數(shù)時，倍數(shù)要位于as前，即twice as…as…故選A．

點評 本題考查倍數(shù)表示法．英語中倍數(shù)的表示法有三種：倍數(shù)+as…as…；倍數(shù)+比較級+than；倍數(shù)+the size/length/weight/width/height/speed of．學習時，要注意區(qū)分和掌握．

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