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
Mother who takes care of everybody is usually the most ______person in each family.
A．considerable
B．considerate
C．tolerant
D．understanding
单项选择题
Even if its economy continues to recover, the US is increasingly becoming a nation of p. timers and temporary workers. This ______work force is the most important trend in American business today.
A．durable
B．disposable
C．available
D．transferable
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