单项选择题

The test conducted is mainly on______.

A．anti-aging effect
B．cognitive function
C．vitamin E intake
D．antioxidants
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单项选择题
When researchers conducted a three-year study involving nearly 3,000 people older than 65, what should these people do first
A．They should fill up a dietary form regularly.
B．They should enable the researchers to evaluate.
C．They should compare different effects of Vitamin E．
D．They should take a regular diet as advised.
单项选择题
Which of the following statements is true, according to the author of this passage
A．Older peopie can also benefit from vitamin E in non-staples.
B．The regular vitamin E intake is effective to all the elderly people.
C．All the elderly people can only benefit from vitamin E in food.
D．Only some elderly people will benefit from vitamin E in foo
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