单项选择题

A．Whether they can afford the cost of the trip.
B．Whether someone will take care of their house, garden and pets while they are away.
C．Whether they should go by air or by sea.
D．Whether the trip will keep them away from home for too long.
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单项选择题
A．There are no rapids or waterfalls.B．There is a constant, strong wind.C．Navigation is rather difficult.D．Frequent storms cause problems for riverboats.
A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.
单项选择题
A．He took the place of a president who resigned his position.B．He had worked for 38 years in Washington DC till 1930.C．He never lost the speech or manners of his hometown.D．He kept two dogs in his ranch in Johnson City, Texas.
A．He took the place of a president who resigned his position.
B．He had worked for 38 years in Washington DC till 1930.
C．He never lost the speech or manners of his hometown.
D．He kept two dogs in his ranch in Johnson City, Texas.
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