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<기출문제 1> ｢2002 수능 18번｣ 다음 글에서 밑줄 친 they가 가리키는 것은?

  When they appeared for the first time in the nineteenth century, they were blank. Soon, pictures were added. They had room for only the briefest of messages - words had to be written on the same side as the picture, leaving the back for an address and a stamp. Later, however, restrictions were lifted. The back was divided to contain room enough for a message, an address, and a stamp. This meant the publishers were free to explore a wide range of subjects. As a result, one of the first popular hobbies of the twentieth century was born.

①　전보                      ②　동화책

③　편지 봉투                  ④　화보집

⑤　그림 엽서