单项选择题

Judging from the fourth paragraph, what does "junk" mean

A．food like ice-cream.
B．food you don't like.
C．pleasure foods.
D．low-quality foods,
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单项选择题
Older people are generally advised to ______ .
A．keep fit by going in for physical activities
B．keep mentally active by challenging their brains
C．maintain mental alertness through specific training
D．maintain a balance between individual and group activities
单项选择题
According to Fozard's argument, people can make their brain work more efficiently by______ .
A．taking part in various mental activities
B．making frequent adjustments
C．going through specific training
D．constantly doing memory work
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