单项选择题

What do you think would be the best title for the passage

A．Accidents and Anxiety.
B．How Accidents Are Caused.
C．Human Factors in Accidents.
D．How to Prevent Accidents on Roads and in Factories.
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单项选择题
According to the author, the accidents are mainly caused by ______.
A．external (外部的) conditions
B．people's internal (内部的) conditions influenced by physical or mental factors
C．slippery (滑的) rod&
D．a chain of events
单项选择题
Which of the following is NOT mentioned as a factor of accidents
A．Mood.
B．Tiredness.
C．Carelessness.
D．Weather.
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