第一部分：英语知识运用（共两节，满分55分）
第一节 单项填空 （共15小题；每小题1分，满分15分）
从Ａ、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并在机读卡上将该项涂黑。
21. Wouldn't it be ______ wonderful world if all nations lived in ____ peace with one another?
A. a ; / B. the ; / C. a; the D. the; the
22. However _____ they are designed, pens should function as a tool to write with.
A. differ B. difference C. different D. differently
