单项选择题

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

A．supported
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．an academic aspect
B．a military aspect
C．a business aspect
D．an international aspect
单项选择题
It was ______ that asked Maury for help in oceanographic studies.
A．the American Navy
B．some early intercontinental travelers
C．those who earned a living from the sea
D．the company which proposed to lay an undersea cable
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