The "mad moments" in the first paragraph refers to the time when we______. In this passage, the author mainly tells us ______.

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问题 The "mad moments" in the first paragraph refers to the time when we______.
In this passage, the author mainly tells us ______.

选项 A、everyone has bad memories sometimes no matter how old he is
B、we can prevent our mind from aging with various methods
C、brain aging starts at the time when we are in the 20s and 30s
D、memory lost is not the sign that we are getting old

答案B

解析 文章第二段开始提到了一本书,主要介绍如何保持大脑年轻,接下来详细地阐述了几种方法,故正确选项为B。
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