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
2023-08-30
59
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 and 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 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
客观事实题。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:http://tihaiku.com/zcyy/2969557.html
相关试题推荐
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
[originaltext]Thediamondisconsideredthemostfamousandvaluablejewel
[originaltext]Thediamondisconsideredthemostfamousandvaluablejewel
[originaltext]Thediamondisconsideredthemostfamousandvaluablejewel
[originaltext]W:3346791.M:Isthatyou,Sue?W:Who’scalling?M:ThisisMik
[originaltext]W:3346791.M:Isthatyou,Sue?W:Who’scalling?M:ThisisMik
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
[originaltext]M:WouldyoulikeacopyofprofessorSmith’s.article?W:Thanks
随机试题
Whatdoesthecompanyhavetopreparefor?[br][originaltext]Ihaveashortan
Thestormsweepingoverthisareanowissuretocause______ofvegetablesint
[audioFiles]audio_eufm_j01_309(200910)[/audioFiles]A、Itisrainy.B、Itissunny
近年来北京市场上出现了品种繁多的热带花卉,这是因为() ①北京自然条件的改变
与人体水液代谢关系最密切的脏腑是A.肺B.脾C.肾D.三焦E.膀胱
滑轮检查项目有:()。(A)滑轮完整无裂纹、转动灵活(B)滑轮轴无磨损现象,
销售布置不适用于()。A.零售商店 B.超级商场 C.工作地单行排列 D
A.分子平均平动动能相同,氢气的内能大于氧气的内能 B.分子平均平动动能相同,
刘少奇在《关于中华人民共和国宪法草案的报告》中对新民主主义社会的性质作出过深刻论
(2020年真题)某企业的产品生产按照工艺顺序需连续经过甲车间、乙车间、丙车间、
最新回复
(
0
)