문제 내용: But she quickly popped her head out again.
  The little mermaid swam right up to the small window of the cabin, and every time a wave lifted her up, she could see a crowd of well-dressed people through the clear glass. ( ① ) It was his birthday, and that's why there was so much excitement. ( ② ) When the young prince came out on the deck, where the sailors were dancing, more than a hundred rockets went up into the sky and broke into a glitter, making the sky as bright as day. ( ③ ) The little mermaid was so startled that she dove down under the water. (④) And look! It was just as if all the stars up in heaven were falling down on her. Never had she seen such fireworks.
선택지 1: ①
선택지 2: ②
선택지 3: ③
선택지 4: ④