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
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
单项选择题
What is the passage mainly about
A．How biochemical changes occur in the human brain.
B．Why biochemical changes Occur in the human brain.
C．How intellectual activities influence brain-cell health.
D．Why people should keep active not only physically but also mentally.
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