문제 내용: 밑줄 친 부분에 들어갈 말로 적절한 것은?
선택지 1: Business people should have good persuasion skills
선택지 2: Persuasion shows up in almost every walk of life
선택지 3: You will encounter countless billboards and posters
선택지 4: Mass media campaigns are useful for the government