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 我認為這次實驗并不是一個失敗的實驗；因為它為我們的未來測試提供了寶貴的經(jīng)驗．

解答 答案：D．
本句中的failure表示一次具體的失敗的實驗，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為一個不可數(shù)名詞，意為"經(jīng)驗"，前面使用零冠詞；故選D．

點評 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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