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。
21. Since three Chinese astronauts piloted Shenzhou IX to link up with Tiangong-1, China’s exploration of _____ outer space has stepped into _____ new era.
A. /; a B. the; a C. a; the D. /; /
22. Linda was expecting her favorite singers, but to her disappointment, _____ turned up.
A. some B. none C. everyone D. no one
23. The practice of hanging clothes across the street is a common ______ in many parts of the city.
A. look B. sign C. sight D. appearance
24. It’s _____ sense that the _____ temperature of the human body is around 37℃．
