第二部分：英语知识运用（共两节，满分 45分）
第一节 单项选择（共15小题；每题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. On December, 3, 2009, Philadelphia 76ers, ______ NBA team, held ______ news conference announcing Allan Iverson would return.
A. a; the B. an; / C. an; a D. the; /
22. How long do you think _________ China launches another manned spaceship?
A. will it be until B. it will be before C. will it be when D. it will be that
