单项选择题

The result of Holmes-Rahe's medical research tells us ______.

A．the way you handle major events may cause stress
B．what should be done to avoid stress
C．what kind of event would cause stress
D．how to cope with sodden changes in life

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单项选择题

The deep-sea listening system makes use of ______.

A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water

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