Pigs are always considered dirty animals because they roll in mud．But in fact th

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Pigs are always considered dirty animals because they roll in mud．But in fact they prefer  being quite clean．They cover themselves with mud to help stay cool．During cooler weather,  they prefer to stay clean．So do elephants,who also cover themselves in dust or mud to keep cool． When they find a place with clean water they will take a bath，using their long noses to give  themselves—or each other—a nice shower
Some animals use dust to get clean．Chinchillas (南美洲栗鼠) have very fine fur． They don`t like to take water baths because water is not warm enough for them．So, instead, they roll  around in fine dust．The dust helps to keep their fur and skin dry．This protects them from disease
Usually, a small bird is a light meal for a crocodile．But when a crocodile wants its teeth  cleaned．it lies on the ground with its mouth open．The crocodile bird goes in and picks out any  parasites(寄生虫)between the crocodile`s teeth or under its tongue．The crocodile gets its mouth cleaned，and the crocodile bird gets dinner．
You wouldn`t think fish would need baths．But some undersea parasites live under the  fish`s skin．“Cleaner”fish，like the wrasse(隆头鱼)，help take them away．The wrasse stands on its head and dances to signal a big fish that it is ready to go into the cleaning business．The big fish will stop moving and open its mouth wide so the wrasse can swim inside and pick out  parasites and bits of food．
小题1:The passage is mainly about how animals         ．

A．stay clean	B．help each other
C．get their food	D．Take baths

小题2:What can we learn from the first paragraph about pigs?

A．They can help each other take baths．

B．They are dirtier during cooler weather．

C．They prefer taking baths to rolling in mud．

D．They like to stay cool and clean．

小题3:Chinchillas use dust to get clean for the following reasons EXCEPT that         ．

A． dust can dry their fur and skin

B．They are not good at swimming

C．Water is too cold for them

D．Dust is good for their health

小题4:From Paragraphs 3 and 4，we earl know that         ．

A．some animals can get clean from others`help

B．Most animals are friendly to each other

C．small animals couldn`t get food from big ones

D．All of the animals prefer to stay clean

小题5:We can infer from the last paragraph that the wrasse

A．is often eaten by other fish

B．1ikes under other fish`s skin

C．is a small kind of fish

D．1ikes taking baths

答案

小题1:A
小题2:D
小题3:B
小题4:A
小题5:C

解析

试题分析：本文是一篇科普类阅读。文章列举了大量的例子介绍了动物们是如何保持洁净的。如猪，南美洲栗鼠及鳄鱼鸟，隆头鱼等。
小题1:主旨大意题。整篇文章都介绍了动物们是如何保持洁净的。故选A。 　
小题2:细节题。从第一段But in fact they prefer  being quite clean．They cover themselves with mud to help stay cool可知正确答案为D
小题3:细节题。文章第二段对ACD均有描述，只有B答案表述不正确，故选B。
小题4:推理判断题。由第三段可知，鳄鱼鸟会帮助鳄鱼清理牙齿；由第四段可知隆头鱼会帮助其他鱼类清理寄生虫。两段共同之处是：某些动物可以依靠其他动物的帮助保持干净。B、C、D三项在文章第三、四段中找不到根据。
小题5:推理判断题。根据文章第四段最后一句可知，隆头鱼可以游入其他鱼类的口中，这说明它是一种小鱼。
点评：文章介绍了动物们是如何保持洁净的。文中列举了大量的例子来介绍动物保持洁净的方式，阅读中要注意把握方式这一线索，多读几遍，然后带着问题通读全文，找出答题依据，完成阅读。