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     Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.

    A．when            B．where            C．that              D．which

     

    【答案】

    C

    【解析】

    试题分析：考查同位语从句：Lawrence Craven,一个来自美国的医生也是几个发表的报道的作家，其中之一介绍了1953年的想法，阿司匹林可以通过使血液稀薄来减轻心脏病的危险。所以这是同位语从句，同位词是idea，that连接的从句对idea的内容进行说明。选C。

    考点：考查同位语从句

    点评：同位语从句的考查主要看同位词，一般情况同位词是一些抽象名词，如belief，fact，order，news等，这里的that只起到连接作用，不做成分，但that是不能省略的。

     

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