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.
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单项选择题
A．It is very economical.B．It provides them with cheaper meals.C．It gives a complicated system.D．It gives free lunch and dinner.
A．It is very economical.
B．It provides them with cheaper meals.
C．It gives a complicated system.
D．It gives free lunch and dinner.
问答题
A．Have a letter of reference.B．Ask help from a professor.C．Get a new letter of reference.D．Submit a current letter.
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