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)
从A、B、C、D四个选项中，选出可填入空白处的最佳选项。
21．—Can I look at the menu for a few seconds before I decide?
—Of course． ，sir．
A．Take your time B．It doesn’t matter
C．Enjoy yourself D．Help yourself
22．Some researchers believe that many patterns of nature are rules of their own and not
affected by natural selection．
A．making B．breaking C．following D．bending
