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질문 내용 : 밑줄친 This(this) 가리키는 것으로 가장 적절한 것은?

The word of this is derived from the Greek word meaning indivisible The idea of this began with ancient Greek philosophers in the 5th century BC. In about 430 BC Democritus of Abdera believed that this was uniform, solid, and hard and that this couldnot be destroyed. Although this Greek theory is important bothhistorically and philosophically, it was not based on observations of nature, measurements, or experiments. Today, we all know this is the basic building block of ordinary matters. This can be combined into a single molecule, but this cannot be divided into anything smaller by ordinary methods. Each of this is made up of smaller particles called electrons, protons, and neutrons.
1. gold 2. vapor 3. cell 4. zero 5. atom

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