1. 根据短文内容，选择正确答案。

    Have you ever seen a horse with toes? Millions of years ago, horses had many toes. They had four toes on each front foot. They had three toes on each back foot. The horses were no bigger than cats.

    These small horses lived in the forest. Their many toes helped the horses run over the soft, wet ground.

    It was very hot in the forest. But the weather changed. It became cold. Many trees could not live in cold weather. The trees died and fell. Open fields took the place of forests. The sun made ground dry and hard.

    Horses began to change, too. They began to get bigger. This took a long time. On the dry, hard land, horses needed only their middle toes for running. Their middle toes became hard. After a long while, horses had only one hard toe on each foot. We call this hard toe a hoof.

1. （1） Long ago, the horse had          toes on each of its front feet.

   A . four B . three C . one D . two
3. （2） Which of the following does this story lead you to believe?

   A . Animals have always been the same as they are today. B . When the earth changed, animals began to change, too. C . Weather stays the same all year long around the world. D . When the earth changed, animals didn't change.
5. （3） What did the horses need on dry, hard land?

   A . On the dry, hard land, horses needed only their middle toes for running. B . On the dry, hard land, horses needed a lot of hoofs for running. C . On the dry, hard land, horses needed to get smaller. D . On the dry, hard land, horses needed nothing.
7. （4） The main idea of the whole story is about        .

   A . the weather never changes B . cats were once much bigger than horses C . horses changed very much over the years D . horses have no toes today