[简答题]Title: 鳄鱼的进化the crocodile’s evolution Question types: 段落大意 Heading 填空 配对 文章内容回顾 详细讲述了crocodiles的生活习惯，如何控制自己的温度以及喜欢的生存环境等。包括提到鳄鱼的特点、历史以及对两组处在不同水供给环境下的生存情况对比。 旧文P2=V09121 英文原文阅读 Early and extinct forms of crocodiles are called Crocodilia. They descended from psuedosuchians who walked on their hind legs, and lived during the late Triassic period. The skull of the crocodile still resembles in many ways those of the primitive archosaurs. Their bodies, however, developed the external appearance of the phytosaurs because of their aquatic lifestyle. The crocodile is the only archosaur that survived the still unknown factors that wiped out most of the reptile class at the end of the Mesozoic period. Though modern crocodiles walk on 4 legs, their two legged ancestry is revealed by their hind legs which are longer than the front legs, making them slant forward when they stand. The crocodilian skull still carries a basically archosaurean shape. It has a rather long, po