单项选择题

The passage implies that the telegraph cable was built mainly ________.

A．for oceanography studies
B．for business considerations
C．for military purposes
D．for investigating the depths of the oceans
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单项选择题
This passage is mainly about ________.
A．the beginning 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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