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    Don’t use your cellphone — we are flying at ____ altitude of 10,000 meters and ____average speech is 678km/h.

    A．an; the           B．the; the           C．the; an           D．an; an

     

    【答案】

    A

    【解析】

    试题分析：句意：不要使用手机—我们现在正在1000米的高空飞翔，平均速度是678km/h. altitude元音音素发音，表示海拔多高时用不定冠词an,第二空用the表示特指飞机的速度，故选A

    考点：冠词

    点评：冠词是中学英语必须掌握的语言点。分为定冠词、不定冠词及零冠词。定冠词the表特指或是双方都知道的人或物，不定冠词a/an表泛指,以元音音素发音开头的单数可数名词要用an,这类题要特别注useful,European,university等词中都是用a,零冠词即不用冠词的情况，多见于一些固定结构中。

     

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