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
54
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
A、ShesharesJack’sopinion.B、Mostpeoplewillfindbasketballboring.C、Jack’sperformanceisdisappointing.D、Shedoesnotag
A、Anyonewithoutbreakfastdoesimprovehisperformance.B、Notgivingpeoplebreakfastimproveperformance.C、Havingbreakfastd
A、Forcompanionship.B、Foramusement.C、Forprotectionagainstrobbery.D、Forhunting.A因果关系判断题。文中给出了两个现在人们养狗的原因:Somepeoplekee
NicotineIfitweren’tfornicotine,peoplewouldn’tsmoketobacco.Why?Becauseofthemorethan4000chemicalsintobacco
Havingnolanguage,infantscannotbetoldwhattheyneedtolearn.Yet,thefirstyearsoflifeisbelievedtobethemostfavo
Opinionsfromotherscientistsmightgolikethis:"Whyshouldtheywanttogetintouchwithus?Theymaywanttoobserveuson
Canmoneybuyhappiness?Yes,exclaimtheauthorsofanew【M1】______study—butonlyuptoapoint.Psychologyhas
Canmoneybuyhappiness?Yes,exclaimtheauthorsofanew【M1】______study—butonlyuptoapoint.Psychologyhas
Canmoneybuyhappiness?Yes,exclaimtheauthorsofanew【M1】______study—butonlyuptoapoint.Psychologyhas
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleareanxiousandself-conscious;thatis,theyare【B
随机试题
断续分齿法飞刀铣削蜗轮时,配置交换齿轮须注意正确选择惰轮数目。()
—Haveyoueverreadthatarticle?—Yes,ButIthinkthereisnothing______initWhichofthefollowingiswrong?
属于串联结构的器官为
A.肝B.心C.肾D.脾E.胃
气血两虚证的舌象是
医生甲退休后,擅自为人看病2年多。某日,甲为乙治疗,需注射青霉素。乙自述以前曾注射过青霉素,甲便未做皮试就给乙注射青霉素,乙因青霉素过敏而死亡。关于本案,下列哪一选项是正确的?
下列不属于市场细分的作用的是()。
下列有关文学常识的表述,不正确的一项是()。
态度是指心理上对其所接触的客观事物对象所持有的看法,并以各种不同的行为方式表露出来。下列不属于态度的要素的一项是()。
使用VC6打开考生文件夹projl下的工程pmjl,其中有“沙发”类Sofa和主函数main的定义。程序中位于每个,/ERROR**********found**********下的语句行有错误,请加以更正。更正后程序的输出应该是:座位数:3
最新回复
(
0
)