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小题; 每小题1分, 满分15分)
21.Some people fear that ________ air pollution may bring about changes in _______ weather around the world. .
A. /; the B. the; / C. an; the D. the; a
22.Nine in ten parents said there were significant differences in their approach to educating their children compared with _______ of their parents.
A. those B. one C. both D. that
