문제 내용: I remember the day Lewis discovered the falls. They left their camp at sunrise and a few hours later they came upon a beautiful plain and on the plain were more buffalo than they had ever seen before in one place.
  (A) A nice thing happened that afternoon, they went fishing below the falls and caught half a dozen trout, good ones, too, from sixteen to twenty-three inches long.
  (B) After a while the sound was tremendous and they were at the great falls of the Missouri River. It was about noon when they got there.
  (C) They kept on going until they heard the faraway sound of a waterfall and saw a distant column of spray rising and disappearing. They followed the sound as it got louder and louder.
선택지 1: (A) - (B) - (C)
선택지 2: (B) - (C) - (A)
선택지 3: (C) - (A) - (B)
선택지 4: (C) - (B) - (A)