第二部分：英语知识运用（共两节，满分35分）
第一节：单项选择（共15小题，每小题1分，满分15分）
21. Your plan sounds great in _______theory, but how will it work in ____practice?
A. the; the B. /;/ C. the;/ D. /;the
22. His great discovery _________ his determination and devotion to science.
A. contributed to B. led to
C. lay in D. resulted in
