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. CWhat is amber derived from?
A、Tropical insects. B、Decayed leaves. C、Tree resin. D、Bird feathers. CWhat is amber derived from?
admin
2005-01-30
103
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 semiprecious(次珍贵的、准宝石的) 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(阿巴拉契亚). It’s found in several other countries, too, though right now scientists are most interested in ambers coming from the Dominican Republic(多美尼加共和国). Because it has a great many inclusions, something like 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.
选项
A、Tropical insects.
B、Decayed leaves.
C、Tree resin.
D、Bird feathers.
答案
C
解析
What is amber derived from?
转载请注明原文地址:https://kaotiyun.com/show/06yO777K
0
托福(TOEFL)
相关试题推荐
DothefollowingstatementsagreewiththeinformationgiveninReadingPassage1?WriteTRUEifthestatementagreeswiththei
Completethenotesbelow.ChooseNOMORETHANTWOWORDSfromthepassageforeachanswer.Howcoral-reef-basedresou
Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.Lang
Lookatthefollowingpeopleandlistofstatementsbelow.Matcheachpersonwiththecorrectstatement.Writethecorrectlette
AccidentalScientistsAAparadoxliesclosetotheheartofscientificdiscovery.Ifyouknowjustwhatyouarelookingfor,fi
Youshouldspendabout20minutesonQuestions27-40,whicharebasedonReadingPassage3below.SourceofKnowledgeAWhatcou
Howlongwillthecustomer’scourselast?Whatdoesthecustomersaythereceptionareashouldbelike?
UnitedStates/USA本题有关虎皮鹦鹉的新栖息地。录音原文中的residentialareas“居民区”是题目中urbanareas“城镇地区”的同义替换。
TheUnitedStates,anationwitha(highly)diversified(economy),isamajor(exporterof)grain,fruit,(chemical),aircraft,
"PhysicalandChemicalPropertiesandChanges"→Sugar,water,andaluminumaredifferentsubstances.Eachsubstancehasspe
随机试题
强制戒毒所可以对强制戒毒的对象进行()。
通过账龄分析表,财务人员可掌握的信息有()
Byadoptingafewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren’slanguagedevelopme
以下关于工伤保险的理解中,符合《社会保险法》规定的有:()
完全垄断型市场是指独家企业生产某种特质产品的情形,即整个行业的市场完全处于一家企业所控制的市场结构。完全垄断可分为()。
甲公司2009年年末有关资料如下:(1)资产总额为1000万元,其中经营资产为800万元,金融资产为200万元;(2)负债总额为600万元,其中经营负债占75%。要求针对下列的不同情况分别回答问题:(1)假设2010年年末的
我国著作权法予以保护的客体包括()等。
资料11985年出生的苏果,来自山东烟台蓬莱的一个小村子,父亲曾是远近闻名的“种粮好手”。在苏果的记忆里,20世纪80年代,父亲的勤劳务实曾让这个家迅速成长为村中的“万元户”。第一个拥有电视机的家庭,第一个盖起二层楼的家庭,第一个安装电话的家庭,
定义—个长度为5值为空的字符串数组,下列选项不正确的是
Nodirectrelationshiphasbeenprovenbetweenhighcholesterollevelsandheartattacks.Boyshaveahigherriskofdeveloping
最新回复
(
0
)