单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
What can we do to avoid the waste of paper

A．Learn to make notepads from unused sides of paper.
B．Cut down on paper consumption.
C．Teach children not to litter.
D．Stop using paper towels.

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Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What can we do to avoid the waste of paper 您的浏览器不支持 audio 元素。