单项选择题

It has been found that vitamin E______.

A．should be taken by patients regularly and persistently
B．can effectively reduce the recurrence of heart disease
C．has a preventive but not curative effect on heart disease
D．should be given to patients with heart disease as early as possible

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单项选择题

According to the author, clinical trials of vitamin supplements______.

A．often result in misleading conclusions
B．take time and will not produce conclusive results
C．should be conducted by scientists on a larger scale
D．appear to be a sheer waste of time and resources