Scientists now have some surprising answers about whether brain power______as we get older.

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问题 Scientists now have some surprising answers about whether brain power______as we get older.

选项 A、reduces
B、descends
C、collapses
D、declines

答案D

解析 reduce:减少:缩小;descend:下降;collapse:倒塌,瓦解;decline:下降,衰退。选项A、B、C均不合题意,故选D。
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