Billy is six years old. He visits his uncle and aunt every summer. They 1 on a farm. They have many kinds of animals like cows, 2 , sheep and a big horse on the farm. Billy loves all the animals and looks after them well.
This summer, he is going to 3 how to milk a cow. His 4 cannot believe(相信) it. "We get our milk from the 5 ," they say. "But our friend is going to get it from a cow."
Billy laughs. "Milk 6 come from the store," he says. "Milk comes from a cow." His friends do not believe him. 7 their teacher says, "Yes, milk comes from cows. Cows eat grass(草). They change the grass into milk. Then the farmer sells the milk. And we 8 it in the stores."
The teacher 9 them one more thing, "Do you know that a cow has four stomachs(胃)?" The kids feel it is very interesting. They want 10 to a farm in the future.
