单项选择题

Throughout this text the author mainly intends to ______.

A．underline the difficulties directly related to aging
B．argue that old age need not be a barrier to success
C．comment on different theories of mental decline in old age
D．state how people can counter the impact of aging on mental faculties
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单项选择题
Scientific studies indicate that ______.
A．higher levels of education are related to greater mental awareness in young age
B．higher levels of education are irrelevant to lower levels of mental decline in old age
C．a higher level of education is the exclusive factor that can slow the rate of mental decline
D．less mental activity in life can probably result in higher cognitive losses in old age.
单项选择题
The phrase sine qua non in Para. 5, Line 1 possibly means ______.
A．the essential elements
B．the premise
C．the contribution
D．the advantage
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