阅读理解
Mr. Black was a farmer. He lived alone by the forest. He had no daughters or sons. He planted rice and vegetables. Also, he sometimes caught small animals for food. So he kept two dogs to help him. One dog was big and the other was small. He liked them very much.
One day, his friend Mr. Smith, another farmer, came to visit him. Mr. Black was very happy. They haven’t seen each other for about three years. When the friend saw two holes(洞) in the door, a big hole and a small hole, he was surprised and said, “My dear friend, 
why are there two holes in your door?” “Let my dogs come in and go out, of course. I finished cutting them just ten minutes ago. It took me three hours to finish the work.” Mr. Smith asked again, “But why are there two holes? One is enough!” “But how can the big dog go through the small hole?” Mr. Black answered.
Sometimes a clever man
may make such mistakes.
根据短文内容，选择正确答案。
1. Why did Mr. Black keep two dogs?
A. To have fun. B. To sell them for money.
C. To help catch the animals. D. To protect his house.
2. What do we know about the dogs?
A. They were both strong. B. They had the same color.
C. One ran faster than the other. D. One is bigger than the other.
3. How did Mr. Smith feel when he saw the holes?
A. Surprised. B. Excited. C. Calm. D. Angry.
4. What does the word “mistakes” mean?
A. 教训 B. 错误 C. 遗憾 D. 成就
5. Which is NOT mentioned(提及) in the passage??
A. Mr. Black planted rice and vegetables.
B. The two holes are on the wall.
C. Mr. Black and Mr. Smith haven’t seen each other for about three years.
D. Mr. Black had no daughters or sons.