Question

Have you ever seen a horse with toes (脚趾)? 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 smaller 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 couldn’t live in cold weather.The trees died and fell.Forest became open field.The sun made the ground dry and hard (坚硬).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.At last their middle toes became hard.

1.Long ago, the horse had four toes on each of its __________.

A．back feet          B．front feet          C．right feet          D．left feet

2.The cats were __________ the horses at that time.

A．as big as          B．smaller than        C．bigger than        D．as small as

3.When the weather changed, __________.

A．many trees grew well in cold weather        B．animals began to change too

C．cats were older than the horses            D．horses were the same as they are

Answer

1.B

2.C

3.B

【解析】

试题分析：这篇短文讲述了当气候发生变化时，动植物都要进行适当的变化来适应气候，才逐渐形成了当今的这些物种。

1.根据They had four toes on each front foot.可知选B。

2.根据The horses were smaller than cats.可知选C。

3.根据短文最后一段描述可知当气候变化时，无论动植物都开始变化。故选B。

考点：关于进化的说明文