Ⅲ. 阅读理解。
The Rat and His Travelling
A rat lived in a field. One day he went out from his home. He wanted to see the world. He never travelled far from his little home. He saw a small molehill(小丘). But in his eyes, it was a mountain. He said, "How large the world is! There are mountains everywhere!" After some days, he got to the sea. There were some oysters(牡蛎). But in his eyes, they were very big ships. Then he said, "Ah! I have passed the earth. Now I have seen the sea world!"
根据短文内容回答下列问题。
1. Where did the rat live?

2. Why did the rat leave his home?

3. What did the rat think of the molehill?

4. What did the rat think of the oysters?

【解析】：本题考查阅读理解的细节查找能力，我们可以直接从短文中定位对应内容得到答案：
1. 短文第一句直接点明了老鼠的居住地点；
2. 短文第三句说明了老鼠离开家的目的；
3. 短文第一段第六句写出了老鼠看到小丘后的想法；
4. 短文倒数第二句写出了老鼠看到牡蛎后的想法。
【答案】：
1. He lived in a field.
2. Because he wanted to see the world.
3. He thought the molehill was a mountain.
4. He thought the oysters were very big ships.