单项选择题

It was ______ that asked Maury for help in oceanographic studies. ( )

A．the American Navy
B．some early intercontinental travellers
C．those who earned a living from the sea
D．the company which proposed to lay an undersea cable

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热门试题

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 animals
C．to estimate the length of cable that was to be made
D．to measure the depths of two oceans

单项选择题

Defied in the 5th paragraph probably means ______. ( )

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