Question

【题目】There’s about 400mm rain fall in this area a year _____

A. on average B. in average

C. of average D. for average

Answer 1

【答案】A

【解析】考查短语辨析。句意：有约这个地区一年的平均雨量为400mm。on average为固定搭配，意为“平均”。故选A项。