Does brain power ______ as we get older? Scientists now have some surprising answers.

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问题 Does brain power ______ as we get older? Scientists now have some surprising answers.

选项 A、descend
B、decline
C、deduce
D、collapse

答案B

解析题型：词汇题。decline衰弱，下降。而descend指物体产生的下降的运动或遗传。deduce演绎，推断。collapse坍塌，崩溃。

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