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        1. There’s no way of knowing why one man makes an important discovery         another man, also intelligent, fails.
          A.sinceB.ifC.a(chǎn)sD.while
          D

          試題分析:句意:沒(méi)有辦法知道為什么一個(gè)人取得重大發(fā)現(xiàn),而另一個(gè)人,也很聰明,卻不能。since 自從if   如果as 像…… 一樣 while 而,卻,引導(dǎo)并列句,符合題意,選D。
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