We can realize how deeply a finger is put into water at body temperature ______. What is the main idea of the passage?

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问题 We can realize how deeply a finger is put into water at body temperature ______.
What is the main idea of the passage?

选项 A、Man has not fully utilized all his senses.
B、Man is not as good as animals in learning about the environment.
C、All senses have their limitations.
D、Insects are more sensitive to colors than man.

答案A

解析 主旨为:人类没有完全利用自己的感觉系统。
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