But most often, people invent things because they think things do not work well enough. Many of the inventions were replacements for earlier, less convenient inventions. People used a stick before someone invented the plow. The paperclip replaced the pin as a way of holding papers together. Electric lights replaced oil and gas lamps. The sailing ship was replaced by the steamship. 1.

2. 3.
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① 논증② 대조③ 묘사
④ 예시⑤ 비교 답이 2번인가요 4번인가요?