【解析】选[A]。根据文中提到的they keep warm because they have a thick layer of fat just under their skins可知,鲸靠皮下的一层厚厚的脂肪取暖,[A]为答案。
34. What do we learn about the blood temperature of a whale?
【解析】选[B]。文中提到的Their blood stays at the sane temperature, even...表明,鲸的体温是衡定不变的,选项[B]正确。
35. In what way do whales distinguish themselves from other land mammals?
【解析】选[A]。从短文的末句Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat可以得知,鲸和其他哺乳动物的区别在于:其他哺乳动物靠身上的毛取暖,而鲸鱼身上几乎没有毛。选项[A]为答案。
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