单项选择题

This passage is mainly about ______.

A．the beginnings of Oceanography
B．the lying 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 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

单项选择题

The word defied in the fifth paragraph probably means ______.

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