第二部分词汇知识运用(共两节，满分40分)
第一节单项选择(共10小题；每小题1分，满分10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。
21.You’re driving too fast. Have you noticed that there is a speed of 40 miles per hour along this road?
A.range B.border C.enquiry D.limit
22.Small businesses are finding it hard to survive in the present economic .
A.atmosphere B.world C.climate D.condition
