题目来源
题目来源1 : The Princeton Review
正确率：70%
难度：易
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题目内容
The "monthly midpoint" is calculated by taking the average (arithmetic mean) of a month`s average high and low. Which of the following is the average monthly midpoint in City X for the 3-month period from July to September?
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以上解析由 考满分老师提供。
