单项选择题
What happens when sea water touches different elements
another subject of study.
A．are
B．is
C．have been
D．was
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单项选择题
The following are the factors of accidents EXCEPT .
A．mood
B．tiredness
C．carelessness
D．weather
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单项选择题
The word accidents-prone (Line 2, Para. 2) means .
A．likely to have accidents
B．injured in accidents
C．possible to die in accidents
D．responsible for road accidents
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