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2019·吉林长春市高三质量检测(二)
The beaver (河狸) is found 1._______(chief) in North America. It is about three and a half feet long, including the fat, paddleshaped tail, 2.________ is a foot in length.
Beavers build themselves most curious huts to live in, and quite frequently 3.________ great numbers of these huts are placed close together. They always build their huts on the banks of rivers or lakes. When they built on the bank of a running stream, they make a dam across the stream for the purpose of keeping the water at the 4._________ (high) they wish. These dams are made of mud, stones and the branches of trees. They are sometimes six or seven hundred feet in length, and they 5._________(construct) so delicate that they look more like the work of men than of little beasts. They start building their huts late in the summer, but do not get them 6.________ (finish) before the early frosts. The freezing temperature makes the heart much 7._________(strong).
A man once saw five young beavers playing. They would leap on the trunk of a tree and push one another off into the water. He crept(匍匐) forward very cautiously and was about to fire on the little creatures；but their amusing tricks reminded him so much 8._________ some little children he knew at home that he thought 9.________ would be inhuman to kill them. So he left them without even 10.__________(disturb) their play.
