单项选择题

A．At the age of 20.
B．By the age of 12.
C．When he was at high school.
D．When he studied in Harvard University.
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单项选择题
A．Staying on campus at weekends.B．Having extra meals.C．Buying single meals.D．Dining in the nearby restaurant.
A．Staying on campus at weekends.
B．Having extra meals.
C．Buying single meals.
D．Dining in the nearby restaurant.
单项选择题
A．They have accidents when they try to outrun other boats.B．They fall overboard when they stand up in their boat.C．They sit or lie on the bottom of their boat.D．They fall asleep and water enters their boat.
A．They have accidents when they try to outrun other boats.
B．They fall overboard when they stand up in their boat.
C．They sit or lie on the bottom of their boat.
D．They fall asleep and water enters their boat.
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