单项选择题

This passage is mainly about ________.

A．the beginning of oceanography
B．the laying of the first undersea cable
C．the investigation of ocean depths
D．the early intercontinental communications

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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

Defied in the 5th paragraph probably means ________.

A．doubled
B．gave proof
C．to challenged
D．agreed to