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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If you want to lose weight, you should not take such food______really necessary.
A．as is
B．as it is
C．as it was
D．as was
单项选择题
Any problem you can solve with a check is not a problem. It is a(n)______.
A．price
B．expense
C．money
D．annoyance
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