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

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单项选择题

Defied in the 5th paragraph probably means ________.

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

单项选择题

The aim of voyages Maury encouraged in the 1840s was ________.

A．to make some sound experiments in the oceans
B．to collect samples of sea plants and animals
C．to estimate the length of the cable that was to be made
D．to measure the depths of two oceans