2009年職稱英語真題之理工類A級(jí)完型填空

　　第6部分：完形填空(第51～55題，每題1分，共15分)

　　下面的短文有15處空白，請(qǐng)根據(jù)短文內(nèi)容為每處空白確定一個(gè)最佳選項(xiàng)。

　　Sharks Perform a Service for Earth's Waters

　　It is hard to get people to think of sharks as anything but a deadly enemy. They are thought to　　(51)　　 people frequently. Although these fish perform a valuable　　(52)　　 for earth's waters and for human beings, business and sport fishing are threatening their　　(53)　　. As a result, some sharks are at risk of disappearing from Earth.

　　Warm weather may influence both fish and shark　　(54)　　. Many fish swim near coastal areas because of their　　(55)　　 waters. Experts say sharks may follow the fish into the same areas,　　(56)　　 people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person　(57)　　 a sea animal, such as a seal (海豹) or sea lion. That is why people should not swim in the ocean when the sun goes down or comes up, because those are the times when sharks are looking for　　(58)　　. Experts also say that bright colors and shiny jewelry (珠寶) may cause sharks to attack.

　　A shark has an extremely 'good sense of　　(59)　　, with which it can find small amounts of substances in water, such as blood, body liquids and chemicals　　(60)　　 by animals. These powerful senses help sharks find their food. Sharks eat fish, any　　 (61) 　　sharks, and plants that live in the ocean.

　　Medical researchers want to learn more about the shark's body defense and immune (免疫的)　　(62)　　 against disease. Researchers know that sharks　　(63)　　 quickly from injuries. They study the shark in hopes of finding a way to fight human disease.

　　Sharks are important for the world's oceans, as they eat injured and diseased fish. Their　　(64)　　 activities mean that the numbers of other fish in ocean waters do not become too　　(65)　　. This protects the plants and other forms of life that exist in the oceans.

　　51　A attack　　　 B meet　　　　 C recognize　　 D visit

　　52　A research　 B experiment　 C service　 　　D analysis

　　53　A power　 　　 B existence　　C mates　　　　 D skills

　　54　A intelligence B shape　　　　C size　　 　　 D activity

　　55　A fresh　　　 B soft　　　　 C warm　　　　　D deep

　　56　A whose　　 　 B which　　　　C that　　　　 D where

　　57　A to　　　 　 B for　　　　　C as　　　　　　D with

　　58　A food　　　 　B help　　　　 C friends　　　 D trainers

　　59　A humor　　 　 B security　　 C smell 　　　　D touch

　　60　A contained　 B produced　　 C used　　　　　D added

　　61　A those　　　 B these　　　　C another　　　 D other

　　62　A systems 　　 B processes　　C ideas　　　　 D theories

　　63　A recover　　 B escape　　 　C return　　　 D cut

　　64　A mental　 　 B hunting　　　C social　　　 D swimming

　　65　A weak　　 　 B little　　　 C few　 　　　　D great

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