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、So they can feel its weight. B、So they can examine its contents. C、So they can guess its age. D、So they can admire its beautif
A、So they can feel its weight. B、So they can examine its contents. C、So they can guess its age. D、So they can admire its beautif
admin
2017-02-24
48
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 preciousstone 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、So they can feel its weight.
B、So they can examine its contents.
C、So they can guess its age.
D、So they can admire its beautiful color.
答案
B
解析
细节题。根据I’m going to pass this piece of amber around so you can see this spider trapped inside it.可知,教授让学生传看琥珀是为了让他们看清里面被困的蜘蛛。因此,正确答案为B。
转载请注明原文地址:https://kaotiyun.com/show/96U7777K
0
大学英语六级
相关试题推荐
尊师重教是中国历来的传统。自古以来,中国人民一直重视教育。教育在中国备受尊敬,因此有学之士具有较高的社会地位,受到他人敬仰。对教育的重视决定了老师的地位,很多谚语体现了对老师的尊重,如:“一日为师,终生为父。”长期以来,老师得到了民众和帝王的敬重,清朝许多
A、Keeplookingforhiswalletmorecarefully.B、Reportthetheftofhiswalletassoonaspossible.C、Makeaphonecalltothes
WhySustainableBuildingsNeedtoFocusonCommunityAndCollaboration?[A]Accordingtothegovernment,buildingsintheUKacco
A、Lookingforapersontotalkto.B、Workingonatroublemakingtalking.C、Tryingtounderstandthetwogenders.D、Tryingtound
A、ChildreninCaliforniaarenotlikelytolearncreativegeography.B、ChildreninprivateschoolsrunbyJapanesearesmarter.
A、TheirBBSwasnotasgoodaswhattheyhadthoughtbefore.B、Theirprogressinthewebsite-designwashinderedforlackoffun
A、Mariebenefitedalotfromthepracticallessons.B、Mariewasabletoreadstorieswiththehelpofherson.C、Mariedecidedt
Largecompaniesneedawaytoreachthesavingsofthepublicatlarge.Thesameproblem,【B1】______,facespracticallyeverycom
Forthispart,youareallowed30minutestowriteanessayonsuccessbyreferringtothesaying"Youcannevercrosstheocean
ShoppricesinJunefellatthefastest【C1】______ratesinceatleast2006as【C2】______foughttoattractcustomers,theBritishR
随机试题
A、金银花B、红花C、丁香D、洋金花E、蒲黄花粉粒众多,极面观略呈三角形的中药材是
(共用备选答案)A.乙醚B.盐酸C.氯化钾D.苦味酸E.亚砷酸及其制剂极毒药品是
药品生产企业可以从事的活动包括()
以下关于刑法解释说法正确的是()
根据《统计法》的规定,国家加强对统计指标体系的科学研究,不断改进统计调查方法,提高统计的科学性、真实性。( )
下列行为,不属于营业税“应税行为”的有()。
根据《行政复议法》的规定,对国税局的具体行政行为不服的,可以向( )申请行政复议。
在法国城市,除博物馆、火车站、音乐厅、教堂等城市标志性建筑外,单体建筑看上去都________,但建筑与建筑之间相互________和呼应,________出统一和谐的整体美。填入画横线部分最恰当的一项是:
TherewilleventuallycomeadaywhenTheNewYorkTimesceasestopublishstoriesonnewsprint.Exactlywhenthatdaywillbei
A、 B、 C、 D、 C一个模型由图形文字说明、词汇表及相互的交叉引用组成,其中图形是主要组成成分,在IDEF0中箭头代表的是数据,而不是流或是顺序。每个矩形框至少有一个控制箭头和输出箭头,一个活动可以没有
最新回复
(
0
)