单项选择题

He never exerts himself to aid those trying to ______ a difficult situation.

A．rectify
B．modify
C．solidify
D．verify
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单项选择题
The advantage claimed for repeating fairy stories to young children is that it ______.
A．makes them come to terms with their fears
B．develops their power of memory
C．convinces them there is nothing to be afraid of
D．encourages them not to have ridiculous beliefs
单项选择题
In the passage, the author mainly discuss ______.
A．the role mental stimulation in preventing mental aging,
B．gradual loss of mental skills with normal aging.
C．the relationship between mental function and spatial skills.
D．effective ways to keep intellectual vigor.
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