We hear only by means of the ears. If we are born deaf, or if injury destroys some important part of the hearing mechanism, then we cannot hear. Similarly, we taste only by means of the taste organs in the mouth, and smell only with the organs of smell in the nose ___________.
Answer: D
Correct answer: In a word, our primary knowledge of the world comes only through the sense organs
The paragraph lists three senses in turn, each with the same structure: we perceive only by means of a particular organ. The blank closes that list, and in a word signals a summing-up of exactly this kind. The option about the eyes and the optic nerve would add a fourth example rather than close the list, and the one about refraction goes into a level of detail the paragraph never uses.
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