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、Its amber contains numerous fossils. B、Its amber is the most durable. C、Its amber is opaque. D、It is the site of the oldest am
A、Its amber contains numerous fossils. B、Its amber is the most durable. C、Its amber is opaque. D、It is the site of the oldest am
admin
2018-02-13
126
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、Its amber contains numerous fossils.
B、Its amber is the most durable.
C、Its amber is opaque.
D、It is the site of the oldest amber deposits.
答案
A
解析
细节题。根据Because it has a great many inclusions,something likes one insect inclusion for every one hundred pieces.可知,多米尼加是琥珀的重要产地,多米尼加有大量的化石,每一百片里就有一片含有昆虫的化石。inclusions的意思是“物质、夹杂物”在此联系上下文译为化石。因此,正确答案是A。
转载请注明原文地址:https://kaotiyun.com/show/G1T7777K
0
大学英语六级
相关试题推荐
Anewstudyfindsthatevenmildstresscanaffectyourabilitytocontrolyouremotions.AteamofneuroscientistsatNewYork
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpeople?AccordingtoarecentstudybytheNationa
Whilethemissionofpublicschoolshasexpandedbeyondeducationtoincludesocialsupportandextra-curricularactivities,the
阴阳(YinandYang),源自古代中国人的自然观。古人观察到自然界中存在着各种对立(antagonistic)、但又彼此相关联的大自然现象,于是,古人以哲学的思维方式,归纳出“阴阳”的概念。早在春秋战国时代(theSpringandAutumn
A、AnAmerican.B、TheFrenchmen.C、AnEnglishman.D、AChineseman.C细节题。由原文可知,第一部电影是在19世纪90年代由一个在美国工作的英国人W.K.L.Dickson制作的。所以正确
A、Newhousesshouldbebuiltinthedowntownarea.B、Newsportfieldsshouldbebuiltinthedowntownarea.C、Moregreenareass
Thatalackofwealthalltoooftentranslatesintopoorhealthmayseempainfullyobvious.Butnowareviewofhealthinequalit
A、Hemadeuphismindtoworkforthedisable.B、Hedecidedtoworkinanautocompany.C、Heunfortunatelyhadacaraccident.D
StatesExperimentwithOut-of-ClassroomLearning[A]AttheendofAugust,mostofOhio’steenagerswillshakeofftheirsummerti
A、Improvedunderstandingofdiseasesofthenervoussystem.B、Improvedunderstandingofatypeofmalnutrition.C、Improvedunder
随机试题
如果发送端全部重发出错的帧和已发送过的后续帧,这种方式称为( )方式。
已知有一关键字序列为{97,86,53,108,72,34,215,146,11,68},如果我们采用直接选择排序方法对此序列进行排序(按照升序排列),请给出每一趟的排序结果。
望发可以帮助了解哪些内脏和物质的盛衰
以下关于原子轨道的叙述正确的为()。
某玻璃厂于2011年面向社会公开招聘了五名职工:小王、小刘、小何、小李和小周。五名职工与玻璃厂签订了合同期分别为两年、一年半、五年、三年和两年的劳动合同,经过入厂培训后,这五名员工分别安排在销售科、总务科、人事科、生产科和运输科。运输科的小周结婚了,他
某股份有限公司共发行股份3000万股,每股享有平等的表决权。公司拟召开股东大会对另一公司合并的事项作出决议。在股东大会表决时可能出现的下列情形中,能使决议得以通过的是()。
目前国内航班编号中的第一个数字表示()。
个人应用一系列的认知操作,从问题的起始状态到达目的状态的过程称之为______。
TeachingMethodsforEffectiveCommunicationI.Introduction:someteachingapproacheshelpfultoclassroomcommunication—wel
Geographyisthestudyoftherelationshipbetweenpeopleandtheland.Geographers(地理学家)compareandcontrast【C1】______places
最新回复
(
0
)