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A snake is a long and thin animal that lives in the __________ or other dark places. It has __________ legs or feet, but it can move very fast. Snakes usually have green, yellow or black skin, so it is difficult for their enemies to find them. Some kinds of snakes live in water. They can swim as freely as __________.

Snakes are __________ animals. They take many things as __________, such as mice, sparrows (麻雀), frogs and birds’ eggs. As snakes look dreadful (可怕的), many people are afraid of them.