单项选择题


A．purposes
B．processes
C．purpose
D．process
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单项选择题
It can be inferred from the passage that older people are generally advised to keep healthy ______.
A．through taking part in physical activities
B．through taking part in mental activities
C．through engaging in both mental and physical activities
D．through engaging in activities individually as well as in groups
单项选择题
When people are engaged in a mental activity, they ______.
A．become much wiser
B．are generally happier
C．will be more careful about what they are doing
D．will have a good memory
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