第一节：单项选择 （共15小题；每小题1分, 满分15分）
21. _____ rise in carbon dioxide is causing ______ steady increase in global warming.
A. The; a B. A; a C. The;不填 D. A；the
22. Can you ______ me a few minutes? I’m not clear about how to fill out the application form.
A. offer B. afford C. spare D. share
23. The house I grew up _____ has been taken down and replaced by an office building.
A. in it B. in C. in that D. in which
24. The news came as no surprise to me. I ______ for some time that the factory was going to shut down.
A. knew B. know C. have known D. had known
