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

A．a(chǎn)n; theB．the; theC．the; anD．a(chǎn)n; an

A

解析試題分析：句意：不要使用手機(jī)—我們現(xiàn)在正在1000米的高空飛翔，平均速度是678km/h. altitude元音音素發(fā)音，表示海拔多高時(shí)用不定冠詞an,第二空用the表示特指飛機(jī)的速度，故選A
考點(diǎn)：冠詞
點(diǎn)評：冠詞是中學(xué)英語必須掌握的語言點(diǎn)。分為定冠詞、不定冠詞及零冠詞。定冠詞the表特指或是雙方都知道的人或物，不定冠詞a/an表泛指,以元音音素發(fā)音開頭的單數(shù)可數(shù)名詞要用an,這類題要特別注useful,European,university等詞中都是用a,零冠詞即不用冠詞的情況，多見于一些固定結(jié)構(gòu)中。

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