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  3. If we had to rely on only five senses for survival, we would be in very sad shape indeed. We wouldn’t know up from down. We woul

If we had to rely on only five senses for survival, we would be in very sad shape indeed. We wouldn’t know up from down. We woul

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问题     If we had to rely on only five senses for survival, we would be in very sad shape indeed. We wouldn’t know up from down. We wouldn’t know when to eat or drink. We wouldn’t know what our muscles were doing or what position our limbs were in. We wouldn’t know when our body was damaged, because we wouldn’t feel pain. We might freeze to death without even a shake,  or overheat without a drop of sweat.  The five senses--touch, taste, smell, hearing and sight--respond only to stimulation from the out- side world, but the inside world of our bodies must also receive and respond to important messages.
    Our internal senses keep us alive and enable us to use our external senses. In effect, the internal senses tell our brains how to run our bodies. Hunger and thirst register in a part of the brain called the hypothalamus, when a lack of food chemicals are detected in the blood.
    Another internal sense that controls our balance is maintained by three fluid-filled loops in the inner ear. Changes in position and gravity affect the motion of this liquid and trigger changes in the brain. A sense called kinesthesia lets us know the relative positions of parts Pf our bodies. Even our breathing is triggered by a sense that identifies an over-abundance of carbon dioxide and a lack of oxygen in the blood.
    No one has been able to count the number of internal senses. The presence of delicate internal senses shows just how marvelously complex we human beings are.
选项 A、internal senses
B、sense of balance
C、five senses
D、brain’s function
答案A
解析 第一段相当于一个开场白。我们除了用五个感官感受外部的世界外，我们还有内部感官。接下来的两段都讲述了内部感官。所以，这篇文章的中心是人类的内部感官。
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