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
38
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、Call on people to protect sharks.
B、Point out the living environment of sharks.
C、Explain why the sharks are dangerous.
D、An introduction to sharks.
答案
D
解析
本文是围绕着鲨鱼的生活习性展开。A,C与本文无关,B只指出了一方面。
转载请注明原文地址:https://tihaiku.com/zcyy/3001861.html
相关试题推荐
[originaltext]LasttimeweoutlinedhowtheCivilWarfinallygotstarted.
[originaltext]M:Pleasecomein,MissEdwards,andclosethedoorbehindyou.W
[originaltext]M:Pleasecomein,MissEdwards,andclosethedoorbehindyou.W
[originaltext]W:OK.Thiswillbemytreat.M:Oh,no,youdon’t.W:Allright,
[originaltext]M:Cathy,I’msorry.They’vejustsaidtheycouldn’tsupplythet
[originaltext]M:Cathy,I’msorry.They’vejustsaidtheycouldn’tsupplythet
[originaltext]M:Cathy,I’msorry.They’vejustsaidtheycouldn’tsupplythet
[originaltext]M:Cathy,I’msorry.They’vejustsaidtheycouldn’tsupplythet
[originaltext]M:Cathy,I’msorry.They’vejustsaidtheycouldn’tsupplythet
[originaltext]Lighttravelsataspeedthatisaboutamilliontimesfaster
随机试题
电影《一江春水向东流》的导演是()A.谢添 B.谢晋 C.谢铁骊 D.蔡楚
辩证否定观包括哪些内容?在对待中国传统文化的问题上如何坚持辩证否定观?
关于超标量技术,下列说法正确的是()。A.缩短原来流水线的处理器周期 B.在每
甲状腺功能亢进A.内分泌功能亢进 B.内分泌功能减退 C.内分泌功能正
与维持正常呼吸关系最密切的两脏是A.心与脾 B.脾与肾 C.肾与肝 D.肝
通过膜受体起调节作用的激素是A.性激素 B.糖皮质激素 C.甲状腺素 D.
长期使用有中毒风险,不推荐用于慢性肾病高磷血症的药物是()A.重组人促红素
合理报酬率定价是在限制资本收益率的基础上确定价格,但是会引起()。A.A效应
总监理工程师下达开工令的前提条件有()。A.设计交底和图纸会审已完成 B.施工
女,30岁。既往无甲亢病史,妊娠两个月时出现怕热、心悸、多汗。查体:甲状腺Ⅰ度肿
最新回复
(
0
)