10．In nature，many plants and animals live together，depending on each other．They are usually very different from their sharing partners，and yet all live an easier life because of each other．It is nature's idea of sharing．
An example of this is the shark and pilot fish．The pilot fish is a little guy and he would be helpless if he hung around by himself in the great ocean．But his smartness makes up for his size．He cleverly swims along beside the shark and when the shark eats，the pilot fish gets the food craps（碎屑） the shark had left．The shark also benefits from this relationship．The pilot fish cleans the craps and eats the insects from the shark's skin．
Another example is the sea anemone and striped clown fish．The anemone looks like a flower but contains poisonous cells．When small fish swim into it，the anemone traps them．However，the striped clown fish is able to swim into the poisonous anemone without being harmed．To pay for his safety，the clown fish brings food to the anemone．He also guides other fish into the anemone's deadly trap．
Large animals，such as the ox and antelope，form such a relationship with the oxpecker，a kind of bird．They provide daily meals to the oxpecker that eats insects．The various large animals act as a restaurant with a varied menu for the oxpecker．What do they get in return from the bird？Free beauty treatments!
Some plants live together in a beneficial relationship．Fungus （菌类） does not have chlorophyll （叶绿素） that plants need to make food．However，the green alga （海藻） does not contain chlorophyll．It is，therefore，able to feed the fungus along with itself．But nothing is free!The fungus repays it by protecting the alga．Since it takes in and stores water，it can provide the alga with an endless water supply．
53．Why does the pilot fish swim along beside the shark？C
A．To do the cleaning for the shark
B．To help the shark to get food
C．To get food and protection
D．To find some insects
54．In order to repay the sea anemone，the striped clown fishB．
A．catches animals for the sea anemone
B．leads other fish into the anemone
C．harms other fish with poison
D．protects the anemone's cells
55．What do we know about oxpeckers？D
A．They are particular about what they eat
B．They are mostly seen near restaurants．
C．They stay away from large animals．
D．They feed on small insects．
56．The author develops the passage mainlyA．
A．by example
B．in comparison
C．by explanation
D．in conclusion．
分析 本篇文章主要讲述了自然界动植物之间如鲨鱼和引水鱼，小丑鱼和海葵，羚羊，牛这些大动物与小的牛琼鸟之间，菌类与海藻之间相互依存，互惠共生，自然界的分享理念
解答 53-56CBDA
53．C细节理解 根据The pilot fish is a little guy and he would be helpless if he hung around by himself in the great ocean．But his smartness makes up for his size．He cleverly swims along beside the shark and when the shark eats，the pilot fish gets the food craps（碎屑） the shark had left．可知引水鱼体积小，它的聪慧弥补了这一点，它喜欢游在鲨鱼身边，狐假虎威，引水鱼得到鲨鱼保护的同时也得到了食物，鲨鱼掉下的碎屑．鉴于这两点，引水鱼喜欢在鲨鱼身边游，故选C．
54．B语义理解 根据To pay for his safety，the clown fish brings food to the anemone．He also guides other fish into the anemone's deadly trap．小丑鱼为了回报海葵，它会把其他鱼引入海葵致命的陷阱里，可知选B．
55．D推理判断 根据They provide daily meals to the oxpecker that eats insects．The various large animals act as a restaurant with a varied menu for the oxpecker．What do they get in return from the bird？Free beauty treatments!他们提供给吃昆虫的牛琼鸟每日三餐，这些大的动物为牛琼鸟充当有大量菜品的餐馆，他们从鸟那边又得到了回报，免费美容治疗可知牛琼鸟以昆虫为食物，故选D．
56．A观点态度 根据An example of this is the shark and pilot fish!鲨鱼和引水鱼Another example is the sea anemone and striped clown fish小丑鱼和海葵，可知作者是通过举例来开展本文的，故选A．
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