单项选择题

A．Industry.
B．Health.
C．The future of our children.
D．Clean air.
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单项选择题
A．How to deal with Americans.B．The cultural heritage of Americans.C．How to do business with Americans.D．How to travel to America.
A．How to deal with Americans.
B．The cultural heritage of Americans.
C．How to do business with Americans.
D．How to travel to America.
单项选择题
A．Because there are many developing nations.B．Because people use so many motor vehicles.C．Because we have more and more industry.D．Because we are building more vehicles.
A．Because there are many developing nations.
B．Because people use so many motor vehicles.
C．Because we have more and more industry.
D．Because we are building more vehicles.
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