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
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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
单项选择题
Because of the currency appreciation of RMB, many people ______dollar against RMB.
A．ran over
B．ran on
C．ran through
D．ran off
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