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.
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单项选择题
A．Industry.B．Health.C．The future of our children.D．Clean air.
A．Industry.
B．Health.
C．The future of our children.
D．Clean air.
单项选择题
A．Frequently.B．Occasionally.C．Seldom.D．Regularly.
A．Frequently.
B．Occasionally.
C．Seldom.
D．Regularly.
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