首页
登录
职称英语
[originaltext] Scientists say sharks have lived in the world’s oceans for mi
[originaltext] Scientists say sharks have lived in the world’s oceans for mi
游客
2023-09-10
27
管理
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://tihaiku.com/zcyy/3001864.html
相关试题推荐
[originaltext]W:Goodmorning!UniversityLanguageCentre.HowcanIhelpyou?
[originaltext]W:Goodmorning!UniversityLanguageCentre.HowcanIhelpyou?
[originaltext]M:MayIknowwhythegoodswedeliveredlastweekwererejected?
[originaltext]M:MayIknowwhythegoodswedeliveredlastweekwererejected?
[originaltext]M:MayIknowwhythegoodswedeliveredlastweekwererejected?
[originaltext]Uptonow,wehavefocusedonthepositiveimpactoftheauto
[originaltext]Uptonow,wehavefocusedonthepositiveimpactoftheauto
[originaltext]Uptonow,wehavefocusedonthepositiveimpactoftheauto
[originaltext]Uptonow,wehavefocusedonthepositiveimpactoftheauto
[originaltext]Themanagerofalargeofficebuildinghadreceivedmanycomp
随机试题
IntheUnitedStates,olderpeoplerarelylivewiththeiradultchildren.B
[originaltext]W:Whatdidyouthinkaboutthemovie?M:Well...IthinkHarryP
某公路工程项目为政府重点投资的项目。根据有关规定,建设单位通过公开招标方式选择某
关于妊娠合并巨细胞病毒说法正确的是A、宫内感染约60% B、多数患儿可以存活
具有促进脾胃运化作用的是A.肝的功能 B.心的功能 C.胆的功能 D.肺的
小儿肝常有余,其病机为A.肝火上炎 B.阴虚阳亢 C.易动肝风 D.肾阴不
Passage2 Globalwarmingiscausingmor
某公司2016年销售收入为1亿元,销售成本为9000万元,2016年年初存货为5
为了使体育课更有利于儿童少年的生长发育。提高他们的体质健康水平,某校的体育老师决
胺碘酮可引起的不良反应不包括A.甲状腺功能紊乱 B.间质性肺炎 C.窦性心动
最新回复
(
0
)