单项选择题

What does the story about the pilot indicate

A．Man knows where the society is going.
B．People don't welcome the rapid development of modem society.
C．The speaker is worried about the future of our modem society.
D．Man can do nothing about the problem of pollution.

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单项选择题

According to the passage, what does man value among the following

A．Industry.
B．Health.
C．The future of our children.
D．Clean air.

单项选择题

Why can't man prevent the world from being polluted

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.