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
61
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
Mymotherisamusicfanandsheenjoys______(sing)verymuch.singing此题考查的是动名词。在动
淋病孕妇经阴道分娩时不会发生A.子宫内膜炎 B.妊娠高血压疾病 C.播散性淋
男性,24岁,体重60kg。烧伤头面部、颈部、双上肢、胸腹部。颜面部可见水泡,创
煮沸法消毒杀灭一般细菌所需时间为A.20min B.40min C.60mi
根据主客原络配穴法,治疗咳嗽兼便秘应选用()A.太渊、列缺 B.合谷、偏
早期原发性肝癌首选的治疗方法是A.肝叶切除术 B.肝移植术 C.肝动脉化疗栓
甲公司为了阻止乙公司向其竞争对手丙公司出售机器设备,伪称有意购买乙公司的机器设备
关于项目的说法,正确的有()。A.项目是一项将被完成的特殊的有限任务 B.项目
如果两项资产的收益率完全负相关,则两项资产的风险可以完全消除。()
某农民将一头死猪以低价出售给邻居食用,造成多人发病,主要症状为腹痛、呕吐、腹泻、
最新回复
(
0
)