单项选择题

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

A．doubled
B．gave proof
C．to challenged
D．agreed to
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单项选择题
It was ________ that asked Maury for help in oceanography studies.
A．the American Navy
B．some early international travelers
C．those who earned a living from the sea
D．the company which proposed to lay an undersea cable
单项选择题
The passage implies that the telegraph cable was built mainly ________.
A．for oceanography studies
B．for business considerations
C．for military purposes
D．for investigating the depths of the oceans
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