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Which one of the following may be best used to describe the flexible sys tern

A．Entirely effective.
B．Totally incorrect.
C．A complete failure.
D．Quite difficult.

单项选择题What's one of the main advantages of Flexible time for workers

A．Have a greater sense of duty.
B．Get higher pay.
C．Avoid working hard.
D．Avoid busy traffi