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.
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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.
单项选择题
A．He can not make a copy because of the copyright.B．He can make his own copy.C．He should wait until tomorrow.D．He can not make a copy now.
A．He can not make a copy because of the copyright.
B．He can make his own copy.
C．He should wait until tomorrow.
D．He can not make a copy now.
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