单项选择题

The passage implies that the telegraph cable was built mainly ______. ( )

A．for oceanographic studies
B．for military purposes
C．for business considerations
D．for investigating the depths of the oceans
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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
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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