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）
从每题所给的A、B、C、D四个选项中, 选出可以填入空白处的最佳选择, 并在答题卡上将该项涂黑。
21. Chinese Premier Wen Jiabao, in_________ interview with Hong Kong reporters on April 13, said that Chinese economy in ________ first quarter showed signs of better than expected positive changes.
A. an, 不填 B. the, the C. the, a D. an, the
22. – Do you know why the river was polluted?
-- Many different factors ___________ the serious pollution of the river.
A. contributed to B. adjusted to C. were accustomed to D. were attached to
23. With no one to ____________ in such a dangerous situation, the lady felt very helpless.
A. turn over B. turn off C. turn on D. turn to
