单项选择题

The underwater listening system was originally designed

A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network

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热门试题

单项选择题

Why is such simplistic advice (Line 1, Para. 3) impossible to follow

A．No one can stay on the same job for long.
B．No prescription is effective in relieving stress.
C．People have to get married someday.
D．You could be missing opportunities as well.

单项选择题

According to the passage people who have experienced ups and downs may become ______.

A．nervous when faced with difficulties
B．physically and mentally strained
C．more capable of coping with adversity
D．indifferent toward what happens to them