Sharks Perform a Service for Earth's Waters

　　It is hard to get people to think of sharks as anything but a deadly enemy1. They are thought to　　1　　people frequently. But these fish2 perform a　　2　　service for earth's waters and for human beings. Yet business and sport fishing3 are threatening their　　3　　Some sharks are at risk of disappearing from   4  

　　Warm weather may influence both fish and shark activity. Many fish swim near coastal areas　　5　　their warm waters. Experts say sharks may follow the fish into the same areas,    6　　people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person　　7　　a sea animal, such as a seal or sea lion. That is why people should not swim in the ocean when the sun goes down or comes up. Those are the　　8　　when sharks are looking for food. Experts also say that bright colors and shiny jewelry may cause sharks to attack.

　　A shark has an extremely good sense of smell4' It can find small amounts of substances in water, such as blood, body liquids and　　9　　produced by animals. These powerful　　10　　help sharks fred their food. Sharks eat fish, any　　11　 sharks, and plants that live in the ocean.

　　Medical researchers want to learn more about the shark's body defense, and immune　　12　　against disease. Researchers know that sharks　　13　　quickly from injuries. They　study the shark in hopes of finding a way to fight human disease.

　　Sharks are important for the world's　　14　　They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too　　15　　This protects the plants and other forms of life that exist in the oceans.

　　词汇:

　　purposely adv.故意地，蓄意地 immune adj.免疫的

　　charge v.(向……)冲(过去) jewelry n.珠宝

　　seal n. 海豹

　　注释：

　　1.It is hard to get people tO think of sharks as anything but a deadly enemy：要让人们相信鲨鱼不是(人类的)死敌不是一件容易的事。anything but意为“决不，远非”，如：His performance in London is anything but a success.(她在伦敦的演出完全不成功。)

　　2.these fish：这些鱼(指鲨鱼)。fish单复数同形，如：0ne fish，two fish，many fish(见第二段第一句)。

　　3.sport fishin9：捕鱼运动。

　　4.sense of smell：嗅觉

　　练习:

　　1. A attack B meet C love D visit

　　2. A terrible B eatable C valuable D possible

　　3. A source B existence C friends D fish

　　4. A Space B Sky C Land D Earth

　　5. A because B since C because of D by reason that

　　6. A whose B which C that D where

　　7. A to B for C like D with

　　8. A times B places C seas D oceans

　　9. A sciences B mathematics C chemicals D physics

　　10. A feelings B senses C touches D tastes

　　11. A those B these C another D other

　　12. A systems B processes C ideas D circles

　　13. A recover B reform C return D rely

　　14. A rivers B oceans C forests D mountains

　　15. A weak B little C few D great

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