15．Acupuncture （針刺療法） is ______ at reducing back pain ______ medicines，according to researchers．（　�。�
A．twice as effective； asB．as twice effective； than
C．effective as twice； asD．twice effective as； than

分析 根據(jù)研究者的說法，針刺療法對減輕背部疼痛的效果是藥物的兩倍．

解答 答案：A
句意表達(dá)的是倍數(shù)；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；倍數(shù)表示法不可混用，本題是倍數(shù)+as…as…．故選A．

點(diǎn)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(xué)習(xí)時(shí)，要注意區(qū)分和掌握．

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