考考你，你能回答与动物有关的一些问题吗？
1. How many legs does a cow have?
2. How many wings does a duck have?
3. How many beaks does a bird have?
4. What else can fly?
5. Can a horse run?
6. Are the two birds different? 
1. Four legs.
2. Two wings.
3. One beak.
4. A bird.
5. Yes, it can.
6. Yes, they are different.
答案不唯一