单项选择题

A. 9 percent. B. 12 percent.
C. 16 percent. D. 18 percent.
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单项选择题
A. Young white-collar men. B. Middle-aged white-collar men. C. Young white-collar women. D. Middle-aged white-collar women.
A. Young white-collar men. B. Middle-aged white-collar men.
C. Young white-collar women. D. Middle-aged white-collar women.
单项选择题
A. He’s tired.B. He lost the race.C. He has already been to the top of the hill.D. He prefers doing exercise indoors.
A. He’s tired.
B. He lost the race.
C. He has already been to the top of the hill.
D. He prefers doing exercise indoors.
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