There’s about 400mm rain fall in this area a year A. on average B. in averageC. of average D. for av

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【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

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【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。