A. They hid in caves and cellars. B. They tried to reduce the temperature. C. They killed 7943 species of plants and animals. D. They ate ice so that the body temperature was reduced. 参考答案:A 答案解析:[解析] 事实细节题。根据文章第四段第二句:The survival of man himself was only possible because of the caves and cellars
第25题: [单项选择]胰头癌胃肠钡餐造影常显示 A. 线样征 B. 跳跃征 C. 反3字征 D. 鸟嘴征 参考答案:C 答案解析:一些疾病的特征X线征象为:克罗恩病X线检查见末端回肠“线样征”。溃疡性肠结核X线检查见X线钡影“跳跃征”。胰头癌合并十二指肠降部受压时,可见“反3征”。乙状结肠扭转钡剂灌肠见扭转部位钡剂受阻,钡剂尖端