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
It is implied in the passage that a competent child （）.

A．does what he is told
B．plays with other children
C．can perform certain task
D．tells other children what to do
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