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  3. 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

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

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问题                 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【C1】______people frequently. But these fish perform a【C2】______service for earth’s waters and for human beings. Yet business and sport fishing are threatening their【C3】______Some sharks are at risk of disappearing from【C4】______.
    Warm weather may influence both fish and shark activity. Many fish swim near coastal areas【C5】______their warm waters. Experts say sharks may follow the fish into the same areas,【C6】______people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person【C7】______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【C8】______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 smell. It can find small amounts of substances in water, such as blood, body liquids and【C9】______produced by animals. These powerful【C10】______help sharks find their food. Sharks eat fish, any【C11】______sharks, and plants that live in the ocean.
    Medical researchers want to learn more about the shark’s body defense and immune【C12】______against disease. Researchers know that sharks【C13】______quickly from injuries. They study the shark in hopes of finding a way to fight human disease.
    Sharks are important for the world’s【C14】______They eat injured and diseased fish.
    Their hunting activities mean that the numbers of other fish in ocean waters do not become too【C15】______. This protects the plants and other forms of life that exist in the oceans.
【C11】
选项 A、those
B、these
C、another
D、other
答案D
解析 本句的中心词是复数的sharks，another所修饰的名词一般是单数，所以不会是答案。these和those是表特指的代词，指代前面出现过的名词。由于前面有any，所以也不可能是答案。剩下的other是答案，any other sharks的说法也合乎英语的用法。
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