单项选择题

"Defied" in the 5th paragraph probably means" ______".

A．doubted
B．gave proof to
C．challenged
D．agreed to
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单项选择题
The proposal to lay a telegraph cable from Europe to America made oceanographic studies take on a(n) ______.
A．academic aspect
B．military aspect
C．business aspect
D．international aspect
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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