A. It helps protect them from other dangerous animals. B. It keeps them cool during the day. C. It keeps them warm by reflecting light. D. It helps them maintain a constant body temperature. 参考答案:B 答案解析:本题测试文章细节。见本文第一段第二句,"light color"反射而不是吸收阳光,它有助于沙漠动物白天降低体温。因此[B]是正确答案。
第28题: [单项选择]老年妇女患骨体疏松的主要病因是() A. 雌激素缺乏 B. 食量减少 C. 运动量降低 D. 肥胖 参考答案:A