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
A、Their tasty meat. B、The principle of their defense system against disease. C、Their solid skin. D、The principle of their birth
A、Their tasty meat. B、The principle of their defense system against disease. C、Their solid skin. D、The principle of their birth
admin
2010-08-21
48
问题
Scientists say sharks have lived in the world’s oceans for millions of years. Scientists say there are more than three- hundred –fifty different kinds of sharks.
Sharks do not have bones, and a shark has an extremely good sense of smell. It can find small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their food. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some tiger sharks. They include shoes, dogs, a cow’s foot and metal protective clothing.
About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies like humans do.
Scientists are beginning to understand the importance of sharks to humans. Medical researchers want to learn more about the shark’s body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases.
选项
A、Their tasty meat.
B、The principle of their defense system against disease.
C、Their solid skin.
D、The principle of their birth modes,
答案
B
解析
相关句子:“Medical researchers want to learn more about the shark’s body defense system against disease.”可以看出人类渴望通过研究鲨鱼的抗病机理以期对人类有帮助。
转载请注明原文地址:https://kaotiyun.com/show/Wg7K777K
0
大学英语六级
相关试题推荐
Asuperstar【B1】______issomeonewhohasbecomefamousinsports,orfilms,orpopularmusic,someonelikeMichaelJackson.Int
A、Itwasthewrongform.B、Hehadnosocialsecuritynumber.C、Thevocabularywasnettoospecific.D、Hecouldn’tread.A综合理解题。因
ThomasMalthuspublishedhis"EssayonthePrincipleofPopulation"almost200yearsago.Eversincethen,forecastershavebein
A、Whatpeopleusedinbuildingtheirhouses.B、Whatpeoplegrewintheland.C、Howpeopledefendedthemselvesagainstthreats.D
A、Shethinksthemanshouldstaywithhissisterathome.B、Sheinvitesthemanandhissistertoherparty.C、Shewillgowith
BluetoothWhenyouusecomputers,entertainmentsystemsortelephones,thevariouspiecesandpartsofthesystemsmakeupa
Urbanlifehasalwaysinvolvedabalancingofopportunitiesand【B1】______againstdangersandstress;its【B2】______forceis,in
A、Sheaskedfor$15.B、Shedonated$50.C、Sherequested$20.D、Shegave$10.D听前浏览选项可以发现答案与she有关,因此,听的过程中一定特别留意thewoman的讲话内
EightTipsforEatingWellAhealthybalanceddietcontainsavarietyoftyposoffood,includinglotsoffruit,vegetables
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleareanxiousand【B1】______;thatis,theyareexces
随机试题
克尔凯郭尔探讨悲剧的哲学基础是()
成人肠套叠的诱因多为
背景资料:某施工单位通过公开招标中标某工程,与业主签订的承包合同部分内容如下:(1)工程合同总价为2100万元,工程价款采用调值公式动态结算;该工程的人工费可调,占工程价款的35%;材料有4种可调:材料1占5%,材料2占15%,材料3占l5%,材料
国家卫生检疫机关发现检疫传染病或者疑似检疫传染病时,除采取必要措施外,必须立即通知当地卫生行政部门,同时用最快的方法报告国务院卫生行政部门,最迟不得超过( )。
2015年1月1日,小王购买了甲公司于当日发行的3年期公司债券,债券面值为10000元,票面利率为4.25%,规定每半年付息一次,小王的购买成本是10250元。2015年7月15日,小王以10300的价格将所持甲公司债券转让给小李。影响债券交易价格的因
下列关于成本分析方法的说法中,正确的有()。
下列不属于夫妻共同财产的是:
甲、乙因事争执互殴,甲用铁条打乙,乙遂抽刀相向。乙妻恐事闹大,奋力夺下乙手中的刀,又恐丈夫吃亏,顺手拿起一木板凳递与其夫,乙持木板凳与甲相抗,不料板凳上的铁钉打中甲太阳穴,致甲死亡。 根据刑法理论,从主客观两个方面分析乙与其妻的行为是否构成犯罪。如构成
从理论上深刻地回答了当时困扰和束缚人们思想的一系列重大问题.推动改革开放和社会主义现代化建设进入新阶段,邓小平理论也逐步走向成熟,邓小平理论的集大成之作是()
[*]
最新回复
(
0
)