16．Many medical scientists are racing        time to find a cure for H1N1as soon as possible．（　�。�
A．onB．againstC．forD．in

分析 許多醫(yī)學(xué)科學(xué)家們正在爭(zhēng)分奪秒地尋找治療h1n1的方法．

解答 答案：B   　
on在…上面；against和…比賽/對(duì)抗；in在…內(nèi)；for為了． 此處，許多醫(yī)學(xué)科學(xué)家們正在爭(zhēng)分奪秒地尋找治療h1n1的方法．爭(zhēng)分奪秒也就是要與時(shí)間賽跑（against the time）．故選B．

點(diǎn)評(píng) 考查介詞用法．注意各個(gè)介詞詞義間的區(qū)別．

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