Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.

A.whichB.whatC.whenD.how

C

解析試題分析:考察定語從句。本題定語從句的先行詞是winter,后面定語從句中的句中成分很完整,故使用關(guān)系副詞when引導(dǎo)該定語從句。BD兩項不能引導(dǎo)定語從句,which在定語從句中做主語,賓語,表語等。句意:很多鳥很虛弱都死在食物緊缺的冬天。故C正確。
考點:考察定語從句
點評:解答定語從句的關(guān)鍵是分析句子成分,如果定語從句中句子成分很完整就使用關(guān)系副詞來引導(dǎo);如果句子缺少主語,賓語,表語或者定語的時候就使用關(guān)系代詞。同時也要注意一些關(guān)系詞的特殊用法,尤其是that/as的特殊用法,既要注意普遍性,也要注意特殊性。特別關(guān)注:Whose是關(guān)系詞中唯一的一個可以放在名詞前面做定語的關(guān)系代詞,如果缺少定語,用whose引導(dǎo)定語從句,或是of which the+名詞/the+名詞+of which。要特別注意which引導(dǎo)非限制性短語從句的用法。

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