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 （菌類） does not have chlorophyll （葉綠素） 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 本篇文章主要講述了自然界動植物之間如鯊魚和引水魚，小丑魚和海葵，羚羊，牛這些大動物與小的牛瓊鳥之間，菌類與海藻之間相互依存，互惠共生，自然界的分享理念
解答 53-56CBDA
53．C細節理解 根據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．可知引水魚體積小，它的聰慧彌補了這一點，它喜歡游在鯊魚身邊，狐假虎威，引水魚得到鯊魚保護的同時也得到了食物，鯊魚掉下的碎屑．鑒于這兩點，引水魚喜歡在鯊魚身邊游，故選C．
54．B語義理解 根據To pay for his safety，the clown fish brings food to the anemone．He also guides other fish into the anemone's deadly trap．小丑魚為了回報海葵，它會把其他魚引入海葵致命的陷阱里，可知選B．
55．D推理判斷 根據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!他們提供給吃昆蟲的牛瓊鳥每日三餐，這些大的動物為牛瓊鳥充當有大量菜品的餐館，他們從鳥那邊又得到了回報，免費美容治療可知牛瓊鳥以昆蟲為食物，故選D．
56．A觀點態度 根據An example of this is the shark and pilot fish!鯊魚和引水魚Another example is the sea anemone and striped clown fish小丑魚和海葵，可知作者是通過舉例來開展本文的，故選A．
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