单项选择题

According to the writer, the top killers in China are ______.

A．stroke
B．cancer
C．heart disease
D．All of the above.
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单项选择题
From the passage, we can know that ______.
A．chronic disease is the leading cause of death only in wealthy countries
B．chronic disease has developed alongside the country's economy
C．chronic disease is not the leading cause of death in China
D．more deaths occurred from the top three chronic diseases in cities than in rural areas in China
单项选择题
______ was the top preventable contributing factor to the deaths.
A．Being underweight
B．Physical inactivity
C．Cigarette smoking
D．High blood pressure
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