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、It has a ribbed shell. B、It has an unusually large valve. C、It was found near the water. D、It is smaller than a mollusc. AWhy
A、It has a ribbed shell. B、It has an unusually large valve. C、It was found near the water. D、It is smaller than a mollusc. AWhy
admin
2005-01-30
54
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、It has a ribbed shell.
B、It has an unusually large valve.
C、It was found near the water.
D、It is smaller than a mollusc.
答案
A
解析
Why does the professor think the fossil might be a brachiopod?
转载请注明原文地址:https://kaotiyun.com/show/x9yO777K
0
托福(TOEFL)
相关试题推荐
Music:LanguageWeAllSpeakSectionAMusicisoneofthehumanspecie’srelativelyfewuniversalabilities.Withoutformaltra
Completethesummaryusingthelistofwords,A-I,below.DeepdivingcraftAdivingcrafthastobe【R37】______enoughtocopewi
Youshouldspendabout20minutesonQuestions27-40whicharebasedonReadingPassage3below.LIFEWITHOUTDEATHUntilrecent
ElephantCommunicationO’Connell-Rodwell,apostdoctoralfellowatStanfordUniversity,hastravelledtoNamibia’sfirst-ev
【1】Whendoesthelostpropertyofficeopen?
Completethenotes.WriteNOMORETHANTHREEWORDSforeachanswer.AbalanceddietAbalanceddietwillgiveyouenoughvitamin
Completethetablebelow.WriteNOMORETHANTWOWORDSforeachanswer.ProductSalesReport
Accordingtothepassage,anorganismwithouthardbodypartsWhydoestheauthormention"aragonite"inline26
(Amost)usefultool(foranalyzing)theelemental(compositionoffossils)istheelectronprobe,a(modify)electronmicroscop
"Bookstore"Whatdoesthewomanimplyabouttheusedbooksshesells?
随机试题
反映企业财务状况的会计要素有()。
不是探望权纠纷案件执行的特点的是()
生活得最有意义的人,并不就是年岁活得最大的人,而是对生活最有感受的人。
在Excel中,选中活动工作表的某个单元格后执行“编辑”菜单中“清除’’中的子命令,可以______。
名义利率的计算公式可表达为纯利率、流动性风险补偿率、通货膨胀预期补偿率和()的合计。
(2011年考试真题)以非现金资产清偿债务的债务重组,下列各项中,债权人应确认债务重组损失的是()。
确定产品成本计算方法的主要因素有()。
19世纪擅长表现农民题材和关怀农民生活的画家是()。
In1985aFrancetelevisioncompanysentitsreporterstotheParisMetro(地铁).Theytook【C1】______toseewhatpassengerswould
设随机变量X,Y都是正态变量,且X,Y不相关,则().
最新回复
(
0
)