新托福写作真经test综合写作解析.doc

新托福写作真经4test8-综合写作解析 　　前程百利小编觉得托福综合写作是托福考试中最容易得分的部分。所以，大家在这部分一定要保证不要失分。小编接下来和大家分享的是托福写作真经4中test8独立写作的内容。从阅读和听力的要点分析，范文的词汇和万能语句出发，帮助大家更好的了解每一个托福写作话题的写作方式。 　　Reading Listening 　　Marsupials are a group of animals that are considered mammals. The kangaroo is the most well-known marsupial. They mainly live in Australia; however, some species are found in New Guinea, South America, and North America. Fossil evidence, however, shows that marsupials once lived virtually everywhere on the planet. Yet because marsupials had trouble adapting to their environments, they died out in most of those places. 　　Marsupials differ from other mammals in that they do not have placentas, and thus mothers do not carry their babies to term. Instead, baby marsupials are born before they are fully developed. Upon being born, a baby marsupial crawls inside a pouch in its mother’s body, where it remains until it matures. Unfortunately, being born prematurely means that most marsupials have undeveloped immune systems. This makes them more susceptible to infections and premature death, which happens with great frequency. 　　Marsupials have a low metabolic rate in comparison with other mammals. To control their body temperatures, mammals must eat food to give them energy. But the low metabolic rate of marsupials means that they have trouble maintaining warmth in their bodies when the temperature becomes cold. As a result, they mostly died out in colder lands and are now primarily found in places with warmer environments such as Australia and South America. 　　In addition, marsupials are absent from many lands nowadays because they were simply outcompeted by mammals. Animals in the same ecosystems typically vie with one another for their food and habitats. Marsupials, weakened by their immune systems and inability to cope with cold weather, were pushed out of many places by mammals, which proved to be far stronger. As a result, marsupials today only live in a few areas around the world. 　　阅读要点： 　　观点