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）
21. Polar bears live mostly on _______ sea ice, which they use as _______ platform for hunting seals.
A. a; a B. a; the C. 不填; a D. the; 不填
22. —Where did you put the car mobile phone?
—Oh, I _____ I put them on the chair because the phone rang as I _____ in.
A. remembered; come B. remembered; was coming
C. remember; come D. remember; was coming
