15．I think English is _____ useful language，and it's also _____ important language．（　�。�
A．an； aB．a； anC．an； theD．a； the

分析 句意：我認(rèn)為英語(yǔ)是一門(mén)有用的語(yǔ)言，也是一門(mén)重要的語(yǔ)言．

解答 答案B language是可數(shù)名詞，這里指一門(mén)有用的語(yǔ)言，還是一門(mén)重要的語(yǔ)言，均表泛指，useful是以輔音音素開(kāi)頭，應(yīng)當(dāng)用不定冠詞a，important是以元音音素開(kāi)頭，所以應(yīng)用不定冠詞an．
故選：B．

點(diǎn)評(píng) 本題考查不定冠詞表泛指的基本用法，解答本題的關(guān)鍵在于對(duì)不定冠詞a/an用法區(qū)別的掌握．

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