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21.A. It is believed to remain basically constant.B. It is a prerequisite for any mental activity.C. It is conducive to relieving mental exhaustion.D. It is thought to be related to food consumption.

21.

A. It is believed to remain basically constant.
B. It is a prerequisite for any mental activity.
C. It is conducive to relieving mental exhaustion.
D. It is thought to be related to food consumption.

题目解答

答案

A

解析

题目要求选择一个关于某个概念的描述。根据选项，A选项表示这个概念被认为基本上是恒定的，B选项表示这个概念是任何精神活动的先决条件，C选项表示这个概念有助于缓解精神疲劳，D选项表示这个概念被认为与食物消耗有关。根据上下文，正确答案是A选项，即这个概念被认为基本上是恒定的。

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