单项选择题

This passage is mainly about ______.

A．the beginnings 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

Defied in the 5th paragraph probably means ______

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

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