单项选择题

By 1900 the American automobile age had begun--12 companies produced a （） of more than 4,000 cars.

A．number
B．quantity
C．total
D．whole

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单项选择题
On this cloudless summer morning every leaf and blade of grass was sparking with （）

A．spray
B．raindrops
C．frost
D．dew
单项选择题
When I bought this watch I was given a year's （）

A．assurance
B．insurance
C．guarantee
D．safety
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