单项选择题

The passage mainly discusses about ______.

A．how Cultural Survival, Inc. helped a tribe to solve the problem of copper mining
B．why local cultures should be saved
C．the work of Cultural Survival, Inc
D．the difficulties in saving local cultures

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单项选择题

The American sleep debt'(Line 1,Par

A．3)is the result of ______.A. the traditional misconception have about sleepB. the new sleep policy of the Clinton AdministrationC. the rapid development of American industryD. the Americans' worry about the danger of sleepness

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