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阅读理解
The horse of 50 million years ago, called the Dawn Horse, was a little animal the size of a fox terrier (一种小狗). It had four toes on each front foot and three toes on each hind foot. Its “toenails” were little hooves (蹄). When this animal lived, there were no grasslands. Its home was the forest, where it fed on tender shoots and leaves. There is proof that this little animal was an ancestor (祖先) of the horse of today. Scientists have discovered fossils (化石) of certain animals that lived a few million years later and found that, although they were bigger than the animal of the earlier times, they looked like it and the modern-day horse.
The horse family survived when many other animals died out because it had two advantages. The little horse ran fast, as we can guess from its thin body and long legs. It was also fairly clever; its skull (头盖骨) shows that its brain was large for its body.
1.It can be inferred from the passage that ________.
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A.three kinds of horse have existed
B.the horse of 50 million years ago has survived
C.it is uncertain that scientists have found fossils of the Dawn Horse
D.horses needed grasslands to survive
2.The Dawn Horse had a total of ________ toes.
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3.The horse family has survived because the Dawn Horse ________.
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A.looked like the fox terrier
B.ate tender shoots and leaves
C.was relatively clever
D.had little hooves for toenails
4.It can be inferred from the passage that the Dawn Horse was a fast runner because of its ________.
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A.brain size
B.similarity to the modern-day horse
C.thin body and long legs
D.number of toes
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