单项选择题

This type of apparatus can produce more than 40,000 blood ______ a day.

A．examples
B．models
C．samples
D．specimen
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单项选择题
Mr. Johnson knew that the most trivial chore could prove to be a ______ if approached with enthusiasm.
A．prize
B．reward
C．refund
D．bonus
单项选择题
Had he kept an eye on the business, his firm ______ the crisis.
A．must have got through
B．would have got through
C．would get through
D．could get through
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