20.We have no idea why one man makes an important discovery         another man,also intelligent(聰明的),fails.( 。
A.sinceB.ifC.asD.while

分析 我們不知道,為什么一個人做出了重大發(fā)現(xiàn),而另一個人,也很聰明,卻失敗了.

解答 答案:D;
根據(jù)語境以及上下文,本題考查的是連詞的用法.根據(jù)語境可以推測句意是"我們不知道,為什么一個人做出了重大發(fā)現(xiàn),而另一個人,也很聰明,卻失敗了."所以該空應(yīng)填while,while在此處表示"然而"之意,故選D

點(diǎn)評 本題主要考查連詞的用法,連詞在句子中主要起聯(lián)系上下文的作用,他們之間的區(qū)別就是表示邏輯關(guān)系的不同,所以在解題時先要理解上下文含義,然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞.連詞的用法都比較多,語義之間還有交叉,熟記其基本應(yīng)用規(guī)則,了解其區(qū)別,注意固定搭配對象,是做好此類題型的關(guān)鍵.

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