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、Tropical insects. B、Decayed leaves. C、Tree resin. D、Bird feathers. C细节题。题目问琥珀是如何形成的,根据Amber is really fossilized tree resin.可知
A、Tropical insects. B、Decayed leaves. C、Tree resin. D、Bird feathers. C细节题。题目问琥珀是如何形成的,根据Amber is really fossilized tree resin.可知
admin
2019-10-03
47
问题
I’m going to pass this piece of amber around so you can see this spider trapped inside it. It’s a good example of amber-inclusion, one of the inclusions that scientists are interested in these days. This particular piece is estimated to be about 20 million years old. Please be extremely careful not to drop it. Amber shatters as easily as glass. One thing I really like about amber is its beautiful golden color. Now, how does the spider get in there? Amber is really fossilized tree resin. Lots of chunks of amber contain insects like this one or animal parts like feathers or even plants. Here is how it happens. The resin oozes out of the tree and the spider or leaf gets in cased in it. Over millions and millions of years, the resin hardens and fossilizes into the precious stone you see here. Ambers can be found in many different places around the world. But the oldest deposits are right here in the United States, in Appalachia. It’ s found in several other countries, too, though right now scientists are most interested in ambers coming from the Dominican Republic. Because it has a great many inclusions, something likes one insect inclusion for every one hundred pieces. One possible explanation for this it that the climate is tropical and a greater variety of number of insects thrive in tropics than in other places. What’s really interesting is the scientists are now able to recover DNA from these fossils and study the genetic material for important clues to revolution.
Now listen to the following recording and answer questions 16 to 19.
16. Why does the professor pass the amber around to the students?
17. What is amber derived from?
18. Why is the Dominican Republic an important source of amber?
19. What type of amber is probably the most valuable for genetic research?
选项
A、Tropical insects.
B、Decayed leaves.
C、Tree resin.
D、Bird feathers.
答案
C
解析
细节题。题目问琥珀是如何形成的,根据Amber is really fossilized tree resin.可知,琥珀其实是树脂化石。因此,正确答案为C。
转载请注明原文地址:https://kaotiyun.com/show/z5W7777K
0
大学英语六级
相关试题推荐
A、Teaching.B、Onvacation.C、Havinglunch.D、Holdingameeting.B
A、Sheisavegetarian.B、Sheeatsgeneticallymodifiedfood.C、Shelikestoeatnaturalfood.D、Shedoesn’tmindthechemicals
Electroniccigarettesarehandheldnicotine-deliverydevicesthat,despiteadevotedfollowing,arecurrentlyswirlingincontro
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
FrustratedwithdelaysinSacramento,BayAreaofficialssaidThursdaytheyplannedtotakemattersintotheirownhandstoregu
A、Afitnessprogramofferedtothegeneralpublic.B、Aphysicalexercisetobuildupmuscles.C、Aprogramthatmakespeoplekeep
A、Theman’sprofessor.B、Theman’sroommate.C、Thewoman’sboyfriend.D、Aneighbour.B细节题。根据I’mhavingproblemslivingwithJo
A、At8:00tomorrownight.B、At7:30tomorrownight.C、At8:00tonight.D、At7:30tonight.D细节题。根据Whydon’tIstopbyatabout7:
WhyhascrimeintheU.S.declinedsodramaticallysincethe1990s?Economistsandsociologistshaveofferedabountyofreas
随机试题
下列哪项不是外感咳嗽与内伤咳嗽的区分要点
A、六君子汤B、补中益气汤C、玉屏风散D、金匮肾气丸E、生脉散哮病缓解期脾虚为主最宜选用
热闭,神昏谵语,痰甚气粗,身热烦躁.舌红苔黄腻者.治宜用
不属于中毒性细菌性痢疾临床特征的是()
改善呼吸功能的措施不包括
【2015改编】某工程项目发包人与承包人签订了施工合同,工期为4个月。工程内容包括A、B两项分项工程,综合单价分别为360.00元/m3、220.00元/m3;管理费和利润为人材机费用之和的16%,规费为人材机费用与管理费和利润之和的4%,增值税销项税率为
劳动统计指标体系的主要任务是要反映()等情况。
西汉初年,经济凋敝,农民大量流亡,城市物价高涨,商人投机囤货。新建立的西汉政权国库空虚,财政困难。汉高祖刘邦为应对这一危机,所采取的措施是()。①士兵罢归家乡,并分配土地②均分田地,打压贵族③严刑罚,重法制④对商人加
曾经依靠自制的望远镜观测到月球及其他星辰的表面形态的天文学家是()。
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderly
最新回复
(
0
)