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，每小题1分，满分15分）
21. At ____ present we are going through a hard time, but I’m sure ____ things will get better in the near future.
A. the; the B. the; 不填
C. 不填; the D. 不填; 不填
22. Scientists in some countries have done a lot of work to _____ the moon.
A. cover B. search C. explode D. explore
