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
The word defied in the fifth paragraph probably means ______.
A．doubted
B．gave proof to
C．challenged
D．agreed to
单项选择题
What can we infer from the passage
A．Minor employers are more likely to commit crimes.
B．Crimes committed by computer experts are difficult to detect.
C．Computer criminals are usually from the cold regions.
D．There are too many criminals for the police to catch.
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