单项选择题

A．Press the "process" key.
B．Insert his card.
C．Memorize his personal number.
D．Insert some coins.
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单项选择题
A．going regularly to a gym.B．taking the right medicine.C．keeping a close watch on her weight.D．taking walking regularly.
A．going regularly to a gym.
B．taking the right medicine.
C．keeping a close watch on her weight.
D．taking walking regularly.
单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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