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
58
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://www.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
A、becauseitmakesyoufailB、becauseitforcesyoutofaceitC、becauseitgive
加色混合是______的混合。
采用租赁方式引进飞机的局限性表现为()。A.经营租赁难以作为一种长期利用飞机
下列不是监理人进度控制的权限为( )。A.发布开工令 B.指示承包人提交赶工
在计算机技术高度发达的今天,我们可以借助计算机完成许多工作,但正是因为对计算机的
石方路堑的开挖宜采用()。A.光面爆破 B.预裂爆破 C.微差爆破
以下有关新生儿败血症的临床表现,错误的是A:产后感染最多见,发生在生后3天内
"压疮的发生率"属于A.前馈控制 B.结果控制 C.过程控制 D.反馈控制
某班学生做完早操回到教室,忽然有人发出“哎哟”的叫声,老师发现原来有人在班干部的
评估信度的方法主要包括()。多选A.重测信度 B.内部一致性信度 C.
最新回复
(
0
)