6．_______many people are excited about GM food，these technologies frighten others．（　�。�
A．WhileB．WhenC．IfD．Unless

分析 盡管許多人對(duì)轉(zhuǎn)基因食品感到興奮，但這些技術(shù)卻使其他人害怕．

解答 答案：A．根據(jù)many people are excited about GM food可知許多人對(duì)轉(zhuǎn)基因食品感到興奮；根據(jù)these technologies frighten others可知這些技術(shù)卻使其他人害怕，因此前后句之間是轉(zhuǎn)折對(duì)比關(guān)系，所以答案是A while表示"雖然，盡管"．其他選項(xiàng)的含義分別是B"當(dāng)…的時(shí)候"；C"如果，是否"；D"除非"．

點(diǎn)評(píng) 考查從屬連詞．【while的用法】
（1）引導(dǎo)時(shí)間狀語從句，從句中的謂語動(dòng)詞應(yīng)用延續(xù)性動(dòng)詞或表示狀態(tài)的詞．
eg．While the discussion was still going on，George came in．當(dāng)討論還在進(jìn)行時(shí)，喬治走了進(jìn)來．
（2）引導(dǎo)讓步狀語從句，多用于句首．意為"盡管，雖然"．
eg．While I admit his good points I can see his bad．盡管我承認(rèn)他的長(zhǎng)處，但我也看到了他的不足．
（3）While作并列連詞用，意思為"而，然而"，表前后意義上的對(duì)比或轉(zhuǎn)折．
eg．There's plenty of rain in the southeast，while there's little in the northeast．東南部雨量充足，而西北部則很少下雨．

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