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
64
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、Sheisavegetarian.B、Sheeatsgeneticallymodifiedfood.C、Shelikestoeatnaturalfood.D、Shedoesn’tmindthechemicals
A、Tohaveathree-weekholiday.B、Tospendhisremainingyears.C、Topatenthisinventions.D、Toteachatauniversity.D
ShouldMedicalSchoolsTurntoThree-yearPrograms?[A]ForTravisHill,itwasanoffertoogoodtorefuse.Lastyearwhen
ShouldMedicalSchoolsTurntoThree-yearPrograms?[A]ForTravisHill,itwasanoffertoogoodtorefuse.Lastyearwhen
Naturally,inagroupofanimalsasdiverseasthesnakes,andwithsomanyvariedenemies,therearenumerousdefensivereactio
Naturally,inagroupofanimalsasdiverseasthesnakes,andwithsomanyvariedenemies,therearenumerousdefensivereactio
Sevenyearsago,whenIwasvisitingGermany,Imetwithanofficialwhoexplainedtomethatthecountryhadaperfectsolution
A、Football.B、Drama.C、Postercompetition.D、Modelmaking.B细节题。由Eachdaykicksoffwithasportsmatch…followedbyallhourof
A、At8:00tomorrownight.B、At7:30tomorrownight.C、At8:00tonight.D、At7:30tonight.D细节题。根据Whydon’tIstopbyatabout7:
随机试题
[*]
ThebestwaytouseEarth’sresourcesmoresensiblyistoreducetheamountsofthingsthatweuseandtoreusethingsinstead
测定土的比重时,对含有一定量的可溶盐、不亲性胶体或有机质的土,用酸性液体测定,并用真空抽气法排出土内气体。()
房屋建筑工程质量保修规定中所指的质量缺陷,是指房屋建筑工程的质量不符合( )。
下列各项中,以每次收入全额为应纳税所得额计算个人所得税的是()。
鉴定结论是具有专门技术知识的人对案件的专门问题进行鉴别、判断所作出的书面意见。()
In17th-centuryNewEngland,almosteveryonebelievedinwitches.Strugglingtosurviveinavastandsometimesunforgivingland
MosteconomiesintheUnitedStatesseemcaptivatedbythespellofthefreemarket.Consequently,nothingseemsgoodornormal
ThisWednesday,GordonBrownwillreplaceTonyBlairasthenewheadofBritain’sLaborParty.Thislong-servingchancellorisa
Accordingtothepassage,moreandmorepeoplearoundtheworldtoday______.Whatcanbethetitleofthepassage?
最新回复
(
0
)