单项选择题

A．Three
B．Five.
C．Seven.
D．Fifteen.
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S4. Varying your exercise program can make your exercise _______.
单项选择题
A．From the wind.B．From manpower.C．From a generator.D．From rechargeable batteries.
A．From the wind.
B．From manpower.
C．From a generator.
D．From rechargeable batteries.
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