单项选择题

Recycling has become the first choice for the　disposal of rubbish because______.

A．local governments fred it easy to manage
B．recycling has great appeal for the jobless
C．recycling causes little pollution
D．other methods are more expensive
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单项选择题
The second sentence of the last paragraph tells us that it is______.
A．preferable to have a sound sleep before a night shift
B．good practice to eat something light before we go to bed
C．essential to make up for cost sleep
D．natural to take a nap whenever we Teel the need for it
单项选择题
The research done by the Dement commission shows that Americans______.
A．don't like to take naps
B．are terribly worried about their national debt
C．sleep less than is good for them
D．have caused many industrial and traffic accidents
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