17．Consumers，whose purchases ________ about 70% of economic activity，face a variety of challenges．（　�。�
A．take upB．account forC．hold upD．turn over

分析 購(gòu)買約占經(jīng)濟(jì)活動(dòng)的70%的消費(fèi)者，面臨著各種各樣的挑戰(zhàn)．

解答 B 考查動(dòng)詞固定短語．take up 占據(jù)；account for在（數(shù)量上，比例上）占…；hold up 舉起，支持；turn over 翻轉(zhuǎn)．根據(jù)句意：購(gòu)買約占經(jīng)濟(jì)活動(dòng)的70%的消費(fèi)者，所以答案選B．

點(diǎn)評(píng) 英語中的固定短語，既不能添詞，也不能少詞，是固定的，要求同學(xué)們?cè)谄綍r(shí)記憶準(zhǔn)確，然后根據(jù)句意找出記憶中的固定搭配，做出正確的答案．

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