15．I don't think the experiment is ___ failure，because it has provided us with ___valuable experience for our future tests．（　�。�
A．不填； 不填B．不填； aC．a； aD．a； 不填

分析 我認(rèn)為這次實(shí)驗(yàn)并不是一個(gè)失敗的實(shí)驗(yàn)；因?yàn)樗鼮槲覀兊奈磥頊y(cè)試提供了寶貴的經(jīng)驗(yàn)．

解答 答案：D．
本句中的failure表示一次具體的失敗的實(shí)驗(yàn)，屬于抽象名詞具體化的用法，所以用不定冠詞a來修飾；而后面的experience為一個(gè)不可數(shù)名詞，意為"經(jīng)驗(yàn)"，前面使用零冠詞；故選D．

點(diǎn)評(píng) 解答冠詞的題目注意分清句中所表示的內(nèi)容是特指還是泛指，表示泛指一般用不定冠詞a（an）；而表示特指用定冠詞the．

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