第二部分：英语知识运用（共两节, 满分30分）
第一节：单项填空（共20小题；每小题0.5分，满分10分）
21. While he was investigating ways to improve the telescope, Newton made ______ discovery which completely changed _______man’s understanding of colour.
A. a; / B. a; the C. /; the D. the, a
22. China's reform and opening has been going on for ______ is like about 30 years now and it's really quite remarkable.
A. that B. which C. what D. it
23. Everything, unless otherwise ______, will go on as planned.
A. stating B. states C. to state D. stated
24. Scientists are convinced ______ the positive effect of laughter ________ physical and mental health.
A. of; at B. by; in C. of; on D. on; at
25. -- I think you should phone Jenny and say sorry to her.
-- _______. It was her fault.
A. Not possible B. Not at all C. No chance D. No way
