8．There's no way of knowing why one man makes an important discovery _____ another man，also intelligent，fails．（　�。�
A．sinceB．ifC．asD．while

分析 句意為：不清楚為什么一個人會有重大發(fā)現(xiàn)，而另外一個同樣聰明的人卻失敗了．

解答 答案：D 本題考查從屬連詞和并列連詞的區(qū)別．根據(jù)句意斷定，該題的空格處需要填入一個并列連詞．乍一看，這四個連詞似乎都是從屬連詞，都不能填入句中．殊不知，在實際的語言運用過程中，while還具有并列連詞的屬性，表示"轉(zhuǎn)折和對比"，正好符合句式結(jié)構(gòu)和語意邏輯．故答案選D．其他三個選項都沒有這種屬性和功能，所以可以排除．

點評 考查并列連詞時，要注意區(qū)分和從屬連詞的區(qū)別．

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★Get Out of Bed Earlier.

If you normally get up at 7:30 a.m. try getting up at 7:00 a.m. That half-hour might not sound like much, but it could be time that you use to exercise, to read that book you've been meaning to finish.2.

★Do the Important Tasks First.

Once you get to work, get the important ones done first (not the easy ones, or even the urgent ones). 3.If you work like this, you’ll usually save time. The urgent tasks will still get done, and you won't miss the important ones.

★Reduce Interruptions.

If colleagues have a habit of hanging around your desk to chat, or if the phone is constantly ringing, you might find that it takes you half the day to finish a simple task like writing a letter.4.

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