문제 내용: 밑줄 친 부분 중 어법상 옳은 것은?
  Compared to newspapers, magazines are not necessarily up-to-the-minute, since they do not appear every day, but weekly, monthly, or even less frequently. Even externally they are different from newspapers, mainly because magazines
선택지 1: resemble like a book
선택지 2: which reports on a number of topics
선택지 3: are specialized to attract various consumers
선택지 4: those interested in the arts