单项选择题

A．He quit his job to go back to school.
B．He was recently laid off from his job.
C．He is working fewer hours these days.
D．He can no longer depend on his parents.
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单项选择题
This passage is written mostly probably for those ______.
A．taking wreck diving as a sport
B．specializing in wreck research
C．focusing on shipwreck archaeology
D．interested in marine medical science
单项选择题
Nitrogen affects underwater divers in that ______.
A．divers who come to the surface too quickly suffer severe pains
B．the bloodstream of divers is compressed by excess nitrogen
C．divers' spinal column is extremely painful for lack of nitrogen
D．divers experience a condition known as the bends during diving
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