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

<上一题目录下一题>

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 and 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

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