单项选择题

How many different forms of communication are mentioned here （）

A．5.
B．7.
C．9.
D．3.

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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

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