单项选择题

A．sure
B．correct
C．popular
D．necessary
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单项选择题
How can the brain keep its power
[A] To increase the amount of research done on the brain.
B. To say exactly what each part of the brain does.
C. To give the brain plenty of exercise.
单项选择题
A．disappointedB．importantC．funnyD．unexpected
A．disappointed
B．important
C．funny
D．unexpected
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