单项选择题

A. Insurance companies. B. Sailors.
C. Manufacturers. D. Merchants.
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单项选择题
A. 9 percent. B. 12 percent. C. 16 percent. D. 18 percent.
A. 9 percent. B. 12 percent.
C. 16 percent. D. 18 percent.
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.
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