单项选择题

______ nutrition can help to slow the aging process--a balanced, healthy whole food diet is essential.

A．Transparent
B．Melancholy
C．Optimal
D．Observable
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单项选择题
Another common ______ about older people is that they are too old to learn new skills.
A．formalities
B．stereotype
C．convention
D．ideal
单项选择题
He had a reputation for being a bit slow-witted but it didn't ______ him in the least.
A．prevented
B．harness
C．fluctuate
D．perturb
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