第一节 单项填空（共30题，每题1分，共30分）
Directions: Beneath each of the following sentences there are four choices marked A, B, C, D. Choose the one answer that best completes the sentence.
21. These days we are all aware of the many threats ______ the environment.
A. at B. to C. on D. in
22. It was ______ that we went camping in the mountains last week.
A. such nice weather B. so nice a weather
C. too nice weather D. nice weather so
23. You like English and French. What ______ languages do you like?
A. another B. other C. the other D. others
24. I consider ______ to see the film next Sunday.
A. to go B. and go C. going
