单项选择题

The returned plastic bottles in New York used to______.

A．end up somewhere underground
B．be turned into raw materials
C．have a second life value
D．be separated from other rubbish
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单项选择题
The American sleep debt (Line 1, Para. 3) is the result of______.
A．the traditional misconception the Americans have about sleep
B．the new sleep policy of the Clinton Administration
C．the rapid development of American industry
D．the Americans' worry about the danger of sleepiness
单项选择题
The purpose of this article is to______.
A．ware us of the wickedness of napping
B．explain the danger of sleepiness
C．discuss the side effects of napping
D．convince the reader of the necessity of napping
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