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; a
C．a; 不填
D．a; a
答案：C
题目分析：考查冠词：句意：我认为实验不是失败，因为它提供我们有价值的经验供将来实验用。第一空填a，a failure是一件失败的事情，是抽象名词具体化，第二空不填，experience是不可数名词，泛指“有价值的经验”，选C。
| 情景交际。有两项是多余选项。 | |
| Millie: Hi. Kitty. you look great today. What a nice coat! Kitty: __1__ My father says it's a Chinese Tang costume (中国唐装). It feels quite soft. I liked it a lot. so my father bought it for me. Millie: __2__ Kitty: Yes. it is. Millie: My old coats are short. I want to buy some new ones. And you know we will have a fashion show next Monday. Kitty: Er. do you have time tomorrow? __3__ Millie: Good idea! __4__ Kitty: Sure. __5__
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