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 aim of voyages Maury encouraged in the 1840s was ______.
A．to make some sound experiments in the oceans
B．to collect samples of sea plants and animals
C．to estimate the length of cable that was to be made
D．to measure the depths of two oceans
单项选择题
Thirty days after the librarian was given the notice, she had to ______.
A．take her revenge on the company
B．leave her job
C．erase all the company's records
D．admit her mistake
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