单项选择题

In contact with the outside world ,a small cultural group should ______.

A．learn something while keeping something of its own
B．remain what they used to be
C．change itself as more, as it can
D．be careful in order not to be cheated

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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

单项选择题

The American sleep debt'(Line 1,Para. 3)is the result of ______.

A．the traditional misconception 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 sleepness