单项选择题

This passage mainly discusses _____.

A．causal reasoning
B．various types of reasoning
C．classification of cause
D．the causal process
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填空题
The roles staff members play are that ______.
单项选择题
Which of the following is NOT true of chronic diseases in the U. S.
A．They account for 70% of all deaths.
B．They are responsible for most of the health care costs.
C．They often result in unhealthy lifestyles.
D．They are largely preventable.
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