单项选择题

From the passage we can infer that ______.

A．most adults in work force of the United States are skillful workers
B．American society is short of skillful workers
C．most schools provide technical education
D．the purpose of education is to learn sciences

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单项选择题

We could afford in Paragraph 3 probably means ______.

A．we were able to buy
B．we were able to spend
C．we were able to bear
D．we were able to give

单项选择题

The students have too much worry because ______.

A．they are facing a changeable world
B．they don't have enough information
C．there are too many adults in American work force
D．they can't make their learning useful