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答案：D
解析：
Choice D is correct. Since Yves picked 75 apples and picks approximately 50 apples per hour, it can be determined that he picked apples for 75/50=1.5 hours.
Because the apple orchard charges $8.50 per hour, Yves can expect to be charged $8.50*1.5=$12.75.
Yves can expect the apple orchard to charge him $12.75.
