单项选择题

A．Everyone at school takes a nap.
B．His mind is so slow that he can’t concentrate.
C．He doesn’t have classes in the afternoon.
D．He works best after a nap.
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单项选择题
A．The drug promoted the country’s export industry.B．The drug had a very bad effect on the country’s economy.C．The drug helped the growth of the country’s economy.D．The drug saved the people from working.
A．The drug promoted the country’s export industry.
B．The drug had a very bad effect on the country’s economy.
C．The drug helped the growth of the country’s economy.
D．The drug saved the people from working.
单项选择题
A．An assembly line in an automobile factory is a very good example of the division of labor.B．One worker stays in one place and waits for a conveyor belt to move the product to him.C．One worker has the responsibility of producing an entire car each year.D．One worker has a particular duty to install a door or add lights.
A．An assembly line in an automobile factory is a very good example of the division of labor.
B．One worker stays in one place and waits for a conveyor belt to move the product to him.
C．One worker has the responsibility of producing an entire car each year.
D．One worker has a particular duty to install a door or add lights.
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