19．---How __________ is it from Xi'an to Dunhuang？
---It's less than 3 __________ flight．（　�。�
A．long； hour'sB．far； hour'sC．long； hours'D．far； hours'

分析 -從西安到敦煌多遠？
-不到三個小時的飛行路程．

解答 答案：D；How long，多長時間；How far，多遠；問兩地之間的距離，用how far．時間的名詞所有格加's．如果是以s結(jié)尾的復(fù)數(shù)名詞只是在s后加'，根據(jù)句中答語It's less than 3推知上句問兩地之間的距離；故用How far；根據(jù)句中的3 __________ flight可知該句用名詞所有格hours'；故選D．

點評 據(jù)句中信息推測出該句的句意是解答此題的關(guān)鍵；還要對給出的答案進行分析和比較，從而作出正確解答．

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