单项选择题

A．Frequently.
B．Occasionally.
C．Seldom.
D．Regularly.
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单项选择题
A．It’s because there are many developing nations.B．It’s because people use too many man-made materials.C．It’s because we have more and more industry.D．It’s because we are building more vehicles.
A．It’s because there are many developing nations.
B．It’s because people use too many man-made materials.
C．It’s because we have more and more industry.
D．It’s because we are building more vehicles.
单项选择题
A．In our daily life.B．In business and universities.C．In government and industry.D．Both A and B.
A．In our daily life.
B．In business and universities.
C．In government and industry.
D．Both A and B.
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