单项选择题

A．They think it is physically exhausting.
B．They are discouraged by the fact that exercise can only work off a small amount of calories.
C．They don’’t think it possible to walk three miles every day.
D．They find consulting caloric-expenditure charts troublesome.
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单项选择题
A．An ice box is a simple device which is made only of wood.B．An ice box will keep food from spoiling for several days.C．A big piece of ice is placed in the bottom.D．An ice box is less costly way than refrigeration to keep food cool.
A．An ice box is a simple device which is made only of wood.
B．An ice box will keep food from spoiling for several days.
C．A big piece of ice is placed in the bottom.
D．An ice box is less costly way than refrigeration to keep food cool.
单项选择题
A．She was invited only for the weekend.B．The weather was too hot.C．She had an appointment.D．She had schoolwork to do.
A．She was invited only for the weekend.
B．The weather was too hot.
C．She had an appointment.
D．She had schoolwork to do.
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