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、Ways to determine the age ora fossil B、The identity of a fossil the woman found C、A comparison of two shellfish fossils D、Plan
A、Ways to determine the age ora fossil B、The identity of a fossil the woman found C、A comparison of two shellfish fossils D、Plan
admin
2005-01-30
21
问题
W: Dr Manning, do you have a few minuets. I’d like to ask you about this fossil I found.
M: Sure Jon. What have you got there?
W: Well, it’s some kind of shellfish. I thought is might be a brachiopod, but I am not sure. I found it when I went out hiking last weekend.
M: I think you might be right. It certainly appears to be a brachiopod. But it’s easy to confuse them with the bivalve mollusks. Superficially they resemble one another. Both have two shells for example.
W: How can you tell them apart then?
M: Well, there are some minor differences in the shell. A lot of brachiopods have ridge shells like this one. There are other distinctions of course. Internally they are quite different. Mollusks and brachiopods belong to different animal groups, and they have been in competition with one another millions of years ago.
W: How old do you think this one is?
M: It’s hard to tell. The earliest brachiopods were from the Paleozoic era, 300 to 500 million years ago. They were quite successful then in terms of number of species. It’s not out of the question that your fossil could be that old.
W: Wow, that’s amazing. Kind of makes paleontology seem more interesting when you can hold it in your hand.
M: You know that gives me an idea. Would you mind bring this to our next class? The others might find it interesting too.
W: Well, I could. But if you don’t already have one in your collection, I thought you might as well keep it.
M: That’s very kind of you.
选项
A、Ways to determine the age ora fossil
B、The identity of a fossil the woman found
C、A comparison of two shellfish fossils
D、Plans for a field trip to look for fossils
答案
B
解析
What are the speakers mainly discussing?
转载请注明原文地址:https://kaotiyun.com/show/C9yO777K
0
托福(TOEFL)
相关试题推荐
TacklingHungerinMsekeniATherearenotenoughclassroomsattheMsekeniprimaryschool,sohalfthelessonstakeplaceinth
Whataretheadvantagesanddisadvantagesofsendingthingsbyair?Whatmightcausedelaysintransportation?
【1】Whatistotheleftofthelostpropertyoffice?
Betweenwhattimesistheroadtrafficlightest?Whichdayoftheweekhastheleasttraffic?
Atthestartofthetutorial,thetutoremphasisestheimportanceof
Benused______asasourceofinformation.Olgasaysthataseriesof______determinesaperson’sfitnesslevel.
ChooseyouranswersfromtheboxandwritethelettersA-Hnexttoquestions26-30.SharonandLesterhavedifferent(26)
Manyorganisationswillpayforthecostofavolunteer’s______toAfrica.Peoplewithout______orextensiveeducationcane
Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.Thecustomsmustbegivennoticeofthegoodsfro
Accordingtotheprofessor,whatisthemajorsignificanceoftheYoungerDryasBoundary?
随机试题
导致“心无所倚,神无所归,虑无所定”的情志因素是()(2006年第12题;2010年第11题)
足月男婴,生后第2天发现黄疸,且进食少,精神差,血清总胆红素250μmol/L,母血型O型,子血型A型,Rh(-),直接抗入球蛋白试验(+)。最可能诊断为( )。一名日龄3天新生儿,足月顺产,出生体重2.5kg,生后第2天出现皮肤黄染,发热,腹泻,第
宜委托多家监理单位进行管理的是( )组织管理模式。
某国有企业工人的工资水平按有关规定从低到高分为一级至五级。根据下表中该企业按2012年年底工人工资状况整理的累积频数分布表,该企业工资等级为四级的工人占全体工人的百分比为()。
根据证券法律制度的规定,上市公司必须编制并公告季度报告,季度报告编制并公告的时间应当是()。
下列关于中外合资经营企业的董事会的说法中,符合规定的是()。
如图所示,物体A放在光滑水平桌面上,用一根细绳系住,若在绳的另一端用大小为mg的拉力拉物体A时,A的加速度为a1,若在绳的另一端挂一质量为m的物体时,物体的加速度为a2,当地重力加速度为g,则()
乳牙充填后,继发龋是常见的并发症,下面哪一项是常见的原因()。
设Ω为曲面z=1-x2-y2,z=0所围的立体,如果将三重积分化为先对z再对y最后对x积分,则I=______.
EastScholasticInstituteEastScholasticInstituteisinvitingitsgraduatestotheGrandAlumniHomecomingonSaturday,Februa
最新回复
(
0
)