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 （珠宝） 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
网考网参考答案：A、C、B、D、C、D、B、A、C、B、D、A、A、B、D
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计，该试题：
27%的考友选择了A选项
2%的考友选择了B选项
27%的考友选择了C选项
44%的考友选择了D选项
考友解析与评论：
· 这个答案有点争议 好像这个考试很多答案都有争议啊
· 我全答错了
· 这题不解，原来选A、C、B、D、C、D、B、A、C、B、D、A、A、B、D，感觉挺好的
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