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（寄生蟲） 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 本文是一篇科教類閱讀，主要講了動物保持干凈的重要性以及一些動物保持干凈的方法．

解答 55-57．ABA
55題答案：A考查主旨大意，文章主要講的是對于動物而言保持干凈是一項重要的生存技能；故本題答案為A選項．
58題答案：B考查細節(jié)推理，根據(jù)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．（野外的很多諸如鹿、狼和熊等動物有一種自動的清理系統(tǒng)…但是他們的"寄主"由于自然過程不斷地掉皮毛）可知本題答案為B選項．
59題答案：A考查細節(jié)推理，文章講了各種不同的動物以不同的方式使自己變得干凈，清潔的方式主要取決于每種動物各自的身體狀況（有的是自然脫落、有的是靠舌頭、一種名為Chinchillas的鳥由于怕冷所以不洗澡而靠塵土…）；故本題答案為A選項．

點評 本文是一篇科教類閱讀，題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．