19．Scientists estimate that plants and animals lived _____ 3.5 billion years ago．（　�。�
A．as far asB．as many asC．as long asD．as old as

分析 科學(xué)家估計(jì)動(dòng)植物三十五億年前就生活在地球上了．

解答 答案：C
as far as遠(yuǎn)達(dá)，只要；as many as多達(dá)；as long as只要，和…一樣長(zhǎng)；as old as和…一樣大．句意表達(dá)的是時(shí)間，故選C．

點(diǎn)評(píng) 介詞用法靈活，搭配較多．學(xué)習(xí)時(shí)要注意積累，對(duì)常考的搭配結(jié)構(gòu)要注意掌握．

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Researchers find willpower is like a muscle—it may get tired from over use. So, if it acts like a muscle, can it also be strengthened? The answer is YES. 1.

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