填空题

S4. Varying your exercise program can make your exercise _______.

【参考答案】

exciting/enjoyable
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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.
填空题
S1. If you want to live an old age, the most important thing you should do is to _______.
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