书城教材教辅科学读本(英文原版)(套装1-6册)
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第42章 第一册(42)

"The mouthfuls of grass pass down into a big bag, which we call the paunch. All the time the sheep is lying down, it is bringing up the grass into its mouth again to chew it. When it is chewed thesheep swallows it again, but it goes down now into another stomach.

"We say the sheep chews the cud, for the grass is brought up in little balls or cuds to be chewed.""Look at the sheep"s feet now," said Will. "They have four toes: two large ones in front, and two little ones behind. The sheep walks onthe two front toes. Each toe has a hard horny case over it. We call the sheep"s foot a hoof, and because it is split in two, we call it a cloven hoof."SUMMARY

The sheep chews the cud. It has no teeth in the front of its top jaw; it has only a pad there. It has great teeth for chewing or grinding, and the jaw moves from side to side, as well as up and down. The sheep tears off and swallows each mouthful of grass without chewing it, then brings it all back into its mouth to be chewed, and at last swallows it again. The sheep has a cloven hoof. Its foot has four toes, but it walks only on the two front ones. It has a thick coat of wool.

Salt

The boys came running home a day or two later, as fast as their legs would carry them.