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

The canal was built with the help of （）

A．the airplane
B．the automobile
C．both the plane and the automobile
D．neither the plane nor the automobile

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