单项选择题

Sign language is said to be very vivid and exact and can be used internationally except for （）

A．spelling
B．ideas
C．whole words
D．expressions

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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

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