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
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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