Question

5．How would you like to brush a crocodile's teeth？Or give a shark a bath？Cats are well-known for the way they keep themselves clean by licking（舔），but other animals have their own ways to stay clean as well．And tidiness can be important for their survival．Even cockroaches（蟑螂）have to keep their feelers clean to help them into food．
    Many animals in the wild，such as deer，wolves and bears，have an automatic cleaning system．Insects like to attach themselves to animals to feed on the skin or blood．These parasites（寄生虫） can be unhealthy．But their"host"animals are constantly dropping skin and fur by a natural process．They also like to rub up against trees or rocks to comfort themselves，and this removes additional skin and fur．Along with old fur goes the dirt and parasites living in the fur．While these animals may sometimes take a bath when they enter or cross a river or lake，they don't need the water to stay clean．They don't get sweaty，because they don't have sweat glands（汗腺）all over their bodies the way people do．Growing new skin and fur is enough to keep them clean．
    Some animals and birds use dust to get clean．Chinchillas，a kind of small animal that lives in
the mountains of South America，have a very fine fur．（They are raised for their fur，in fact．）If they took water baths，they might get too cold．So，instead，they roll around in fine dust，raising
quite a cloud as they"bathe"．The dust helps to keep their fur and skin dry．This protects them
from bacteria and parasites that enjoy warm and wet places．And the fine dust doesn't stick in their
fur for long．It falls off or blows away．
    As for lions and tigers．their rough tongues act like combs and can remove dirt and loose fur．
Why is it important for them to stay clean and smooth？It helps them stay cool in very hot summer or feel warm in cold winter．
55．What's the main idea of this passage？A
  A．For animals，cleanliness is a survival skill．
    B．Animals enjoy living in a clean environment．
    C．Unlike people，animals hate staying in water．
    D．Animals fight against parasites in different ways．
56．According to the passage，such animals as deer，wolves and bears clean themselves byB   
    A．living with parasites
    B．replacing their skin and fur naturally
    C．climbing trees or rocks
    D．having a bath in a river or lake
57．It can be inferred from the passage that the way some animals stay cleanA    A．is decided by their physical conditions
    B．is better than the way people do
    C．keeps them away from parasites all the time
    D．helps them survive any danger in the wild．

Answer 1

分析 本文是一篇科教类阅读，主要讲了动物保持干净的重要性以及一些动物保持干净的方法．

解答 55-57．ABA
55题答案：A考查主旨大意，文章主要讲的是对于动物而言保持干净是一项重要的生存技能；故本题答案为A选项．
58题答案：B考查细节推理，根据文章第二段的Many animals in the wild，such as deer，wolves and bears，have an automatic cleaning system…But their"host"animals are constantly dropping skin and fur by a natural process．（野外的很多诸如鹿、狼和熊等动物有一种自动的清理系统…但是他们的"寄主"由于自然过程不断地掉皮毛）可知本题答案为B选项．
59题答案：A考查细节推理，文章讲了各种不同的动物以不同的方式使自己变得干净，清洁的方式主要取决于每种动物各自的身体状况（有的是自然脱落、有的是靠舌头、一种名为Chinchillas的鸟由于怕冷所以不洗澡而靠尘土…）；故本题答案为A选项．

点评 本文是一篇科教类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．