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

In scope and difficulty, the canals construction was most closely alike to that of the （）

A．Suez Canal
B．trans-Siberian Railroad
C．Taj Mahal
D．pyramids of Egypt

单项选择题

Which of the following statements best summarizes this passage（）

A．When language is a barrier, people will find other forms of communication.
B．Everybody uses only one form of Communication.
C．Nonlinguistic language is invaluable to foreigners.
D．Although other forms, apart from language of communication exist, they are of little valu