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.
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单项选择题
Which one of the following may be best used to describe the flexible system
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 workrs
A．Have a greater sense of duty.
B．Get higher pay.
C．Avoid working hard.
D．Avoid busy traffic.
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