문제 내용: 어법상 옳은 것은?
선택지 1: The traffic of a big city is busier than those of a small city.
선택지 2: I'll think of you when I'll be lying on the beach next week.
선택지 3: Raisins were once an expensive food, and only the wealth ate them.
선택지 4: The intensity of a color is related to how much gray the color contains.