单项选择题

What does this passage mainly discuss

A．Taking a large amount of VC will do good to health.
B．Taking too much VC pills every day is not good for health.
C．People should take as much VC as possible.
D．It is not necessary at all to take VC pills.

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单项选择题

Taking a lot of VC ______.

A．is supported by VC experts
B．is encouraged by the US government
C．is agreed by medical researchers
D．is disapproved by many scientists