问题补充：
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 no bigger than the cats.These small horses lived in the forest. The toes helped the horses run on the soft, wet ground.
At first, it was very hot in the forest. But the weather changed. It became very cold. Many trees could not live in cold weather. The trees died and fell. Open fields took the place of forests. The sun made the ground dry and hard.
Horsed 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 time, horses had only one hard toe on each foot. Now we call this hard toe a hoof.
【小题1】How many toes did a horse have millions of years ago?A．14B．12C．16D．13【小题2】What does the underlined word “hoof” mean in Chinese?A．尾巴B．马鬃C．腿D．蹄子【小题3】What was the weather like in the forest at first?A．Very warmB．Very hotC．Very coldD．Very cool【小题4】Which is WRONG according to the passage?A．The horses were much bigger than the cats millions of years ago.B．The trees died and feel because the weather changed.C．On the dry, hard land, horses needed only their middle toes for running.D．The horses have fewer toes than before.【小题5】The main idea of the passage is that.A．horses had three toes on each back foot.B．horses lived in the hot forestC．horses changed a lot over the yearsD．horses didn’t like the cold weatherA
答案：
(答案→)A
解析：这篇短文主要介绍了马在多年来的进化情况。
【小题1】根据第一段They had four toes on each front foot. They had three toes on each back foot.计算可知4*2+3*2=14，选A。
【小题2】联系前一句After a long time, horses had only one hard toe on each foot.描述及常识，可知这个单词指的是马蹄，故选D。
【小题3】根据第二段At first, it was very hot in the forest. 描述，可知选B
【小题4】根据第一段The horses were no bigger than the cats.描述，可知那是马比猫不大，故选A。
【小题5】这篇短文主要介绍的马的体型及马蹄的变化，故选C，多年以来马改变了很多。
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