题目内容：

Gap-filling

A visitor from the c1. asked the farmer many q2.. He pointed to an a3. in the field. "Why doesn't that cow have any horns(角)?"

"Well," said the farmer. "There are three r4. why a cow may not have h5.. Some cows are born w6. horns. Some cows lose their horns i7.they are sick. And we cut the horns of some cows to k8. them from hurting p9.. But the reason that that cow there doesn't have a10. horns is that it is a horse."