单项选择题

According to the passage, sudden deaths are probably caused by ______.

A．mental stress
B．physical diseases
C．unexpected accidents
D．poisons
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单项选择题
The writer's attitude towards sudden deaths is ______.
A．objective
B．subjective
C．scientific
D．careful
单项选择题
According to the passage, how many sudden deaths are reported all over the world
A．400,000
B．600,000
C．800,000
D．none of the above
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