首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every yea
Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every yea
admin
2010-09-10
51
问题
Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every year, a few types of sharks injure about 100 people worldwide and kill about 25. Most attacks are by great white sharks, which often feed on sea lions and other marine mammals (海洋哺乳动物) . They sometimes mistake human swimmers for their normal prey, especially if they are wearing black wet suits.
If you are a typical ocean-goer, your chances of being killed by an unprovoked attack by a shark are about 1 in 100 million. You are more likely to be killed by a pig than a shark and thou sands of times more likely to get killed when you drive a car. Sharks help save human lives. In addition to providing people with food, they are helping us learn how to fight cancer, bacteria (细菌), and viruses. Sharks are very healthy and have aging processes similar to ours. Their highly effective immune system allows wounds to heal quickly without becoming infected, and their blood is being studied in connection with AIDS research.
Sharks are among the few animals in the world that almost never get cancer and eye cataracts (白内障). Understanding why can help us improve human health. Chemicals extracted from shark cartilage (软骨) have killed cancerous tumors in laboratory animals, research that someday could help prolong your life.
Sharks are needed in the world’ s ocean ecosystem. Although they don’ t need us, we need them. We are much more dangerous to sharks than they are to us. For every shark that bites a person, we kill one million sharks.
The passage mainly discusses ______.
选项
A、the number of people being attacked by sharks
B、the benefits of sharks to improving human health
C、the dangers sharks have brought to human beings
D、the relationship between sharks and human beings
答案
D
解析
主旨题。选项A、B和C都过于片面,不能概括出文章的主题。答案为D。
转载请注明原文地址:https://kaotiyun.com/show/KB87777K
0
大学英语四级
相关试题推荐
Itusedtobethecasethatifyouleftyourcarinthesunonahotsummer’sday,thengettingbackinagainafterwardswasago
NicotineIfitweren’tfornicotine,peoplewouldn’tsmoketobacco.Why?Becauseofthemorethan4000chemicalsintobacco
Havingnolanguage,infantscannotbetoldwhattheyneedtolearn.Yet,thefirstyearsoflifeisbelievedtobethemostfavo
Havingnolanguage,infantscannotbetoldwhattheyneedtolearn.Yet,thefirstyearsoflifeisbelievedtobethemostfavo
A、AfteranEastermagazineprintedoneofhisstories.B、WhenthepublicbecameinterestedinAmericanauthors.C、Whenhereturn
A、Business.B、Physics.C、Artappreciation.D、Psychology.A
Canmoneybuyhappiness?Yes,exclaimtheauthorsofanew【M1】______study—butonlyuptoapoint.Psychologyhas
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleareanxiousandself-conscious;thatis,theyare【B
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleareanxiousandself-conscious;thatis,theyare【B
随机试题
简述无差异市场营销的优缺点。
在Windows中,删除文件和文件夹的错误说法是______。
当一个应用程序窗口被最小化后,该应用程序将被终止执行。()
阅读《陌上桑》中的首段,然后回答下列小题。日出东南隅,照我秦氏楼。秦氏有好女,自名为罗敷。罗敷喜蚕桑,采桑城南隅。青丝为笼系,桂枝为笼钧。头上倭堕髻,耳中明月珠。湘绮为下裙,紫绮为上襦。行者见罗敷,下担捋髭须。少年见罗敷,脱帽著帩头。耕者忘其犁,锄者忘其
Katie,I’veboughtmany_____Nowlet’smakethebirthdaycakeforHarriet.
急性支气管炎与流行性感冒的鉴别要点是
患者,男,75岁。7天前因胆囊多发小结石行腹腔镜胆囊切除术,近2日来发现巩膜黄染。此时最好的处理方法是
巴厘岛是印度尼西亚唯一信奉伊斯兰教的地区。()
某区政府在整顿市容时对某个农贸自由市场作出了关闭的决定,该行政行为属于:
创新型企业是指拥有很多知识产权、创新项目的企业。它们的负债比例与传统行业相比()。
最新回复
(
0
)