填空题

The output of the factory ______ (这几年简直翻了一番).

【参考答案】

has virtually doubled over the past few years
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单项选择题
From the passage, we learn people will have to keep working until their mid-70s because of ______.
A．overall improvement of people’s health condition
B．old people’s high qualification
C．the lack of young employees
D．the great need for more employees by new economy
填空题
usual→unusual
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