第二部分：英语知识运用（共两节，满分35分）
第一节 语法和词汇知识（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。
例: It is generally considered unwise to give a child he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B。
21. World Expo is regarded as the Olympic Games of the economy, science and technology, expert said.
A. A; an B. The; an C. The; a D. A; the
