单项选择题

Everyone is required to______ his feet on the carpet to shake off the snow from his hoots before entering the shopping mall.

A．stamp
B．stretch
C．sway
D．kick
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单项选择题
A key factor in Beijing's winning ______was a promise to improve the city' s poor air quality.
A．host
B．battle
C．bid
D．chair
单项选择题
Research discovered that plants infected with a virus give off a gas that______ disease resistance in neighboring plants.
A．contracts
B．activates
C．maintains
D．prescribes
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