单项选择题

A．They are available year-round.
B．They are often filled by tourists.
C．They often involve a great deal of physical labor.
D．They are restricted to high school students.
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单项选择题
A．300,000.B．400,000.C．500,000.D．600,000.
A．300,000.
B．400,000.
C．500,000.
D．600,000.
填空题
spending
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