第二部分：英语知识运用（共两节, 满分45分）
第一节：单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21．China is needed as a direct participant in the dialogue with Iran, for China will also be affected if the effort to ____ ends in failure．
A．battle B．negotiate C．invest D．share
22．She's under the impression that she's a great actress, we never ____ her in anything she says because it's time wasted．
A．treat B．cheat C．contradict D．consult
23．The chance to get a college education must not be a ____ of the few—it should be a birthright of every single American．
A．protection B．prejudice C．privilege D．platform
24．But while many Americans see their cars as an ____ of their individual freedom, to some of us owning a car is
