首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Their tasty meat. B、The principle of their defense system against disease. C、Their solid skin. D、The principle of their birth
A、Their tasty meat. B、The principle of their defense system against disease. C、Their solid skin. D、The principle of their birth
admin
2009-04-23
33
问题
Scientists say sharks have lived in the world’s oceans for millions of years. Scientists say there are more than 350 different kinds of sharks.
Sharks do not have bones, and a shark bas 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
Why sharks are useful for humans?
转载请注明原文地址:https://kaotiyun.com/show/6SZK777K
0
大学英语六级
相关试题推荐
Nomatterhowlongorshorttheletteris,whatreallycountsisthatit’sheart—warming.
Flyingiseasilythefastestwaytotravellong【T1】______.AshipcansailacrosstheAtlanticinthreeandahalfweeks.TheC
To:AllstaffFrom:PersonnelDept.Date:December26th,2008Subject:AppointmentofaNewVicePresidentYouwillbepleas
LadiesandGentlemen,WelcometoLondonInternationalLanguageCenter.WeteachEnglishforboth【T1】______andbusinesspurpo
HelsinkiCard(赫尔辛基卡)enablesthetouristtotravelfreeonthebuses,trainsandsubways.Holdersofthecardenjoya70%disco
Thispartistotestyourabilitytodopracticalwriting.YouarerequiredtowriteaMemoaccordingtothefollowinginformati
Thisbookisdividedintosixteenunitsthatdealwithtopicsofeverydayconversation.
Whichkindofjobshouldyouchoose?Youshouldchooseajobthatyou_____________________.
ScienceFictionAmongthemostpopularbooksbeingwrittentodayarethosewhichareusuallyclassifiedassciencefictions.
Forthispart,youareallowed30minutestowriteashortessayentitledTheMostImportantInfluenceonChildren.Youshouldw
随机试题
甲县造纸厂因超标排放的污染物先后造成8户养殖专业户所养育苗大面积死亡,损失12万元。甲县环保局根据《水污染防治法》的规定,对造纸厂作出如下处理决定:(1)赔偿受损害的8户养殖专业户经济损失8万元;(2)罚款2万元;(3)立即对污染严重的生产项目停产整顿。造
交谈时的最佳角度是()度。
在逻辑门电路中,符合“全1出1”的是()。
直肠指检,扪到质软可推动的圆形肿块,指套染有新鲜血迹者应考虑直肠指检,扪到条索状,伴有轻压痛,挤压时外口有脓性分泌物流出者应考虑
患者,女,29岁,已婚。自诉咽中如有物阻,咯吐不出,吞咽不下,胸膈满闷。诊查:舌苔白腻,脉弦滑。治宜选用()
为确保证券市场安全稳定运行,《债券登记、托管与结算业务实施细则》的实施将采取“新老划断”的处理方式。()
小学班主任王老师通过阅读其他教师的教学札记,学习到很多新的教学知识和教学观念,这种教学反思方法属于()。
实现()是中同共产党人的一贯主张,是发展中国特色社会主义的重大任务。
A、DYBEAFCZXB、YDEBFZXCAC、ABDYECFXZD、ABCDEFXYZC前序遍历是指在访问根结点、遍历左子树与遍历右子树这三者中,首先访问根结点,然后遍历左子树,最后遍历右子树;并且,在遍历左右子树时,仍然先访问根结点,然后遍历左
A、Noonewantstolookatthecloset.B、Themanhasalreadycleaneditup.C、Ithasgraduallybecomeatrashcan.D、Itisoccupi
最新回复
(
0
)