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
50
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
OxfordUniversityoncefamouslyclaimedtohavebeenfoundedbyAlfredtheGreatinthe9thCentury.Butinfact,theUniversity
A、Lookingforapersontotalkto.B、Workingonatroublemakingtalking.C、Tryingtounderstandthetwogenders.D、Tryingtound
Oneofthemostcommonimagesofanadvanced,Western-stylecultureisthatofabusy,traffic-filledcity.Sincetheirfirst【B1
A、10.B、4.C、3.D、1.C短文说,Johnson全家用了三年的时间攒够了里程数才换了免费机票。故答案是C。四个选择是数字,初步猜测题目问的可能与数字细节有关,边听边做好笔记。
DoctorsinBritainarewarningofanobesity(肥胖症)timebomb,whenchildrenwhoarealreadyoverweightgrowup.So,whatshouldwe
A、Thewomanhatedthemantalkingthroughoutthemovie.B、Thewomansawacomedyinsteadofahorrormovie.C、Thewomanprefers
A、Shedoesn’twantthemantocallsoearly.B、Sheurgesthemantocallimmediately.C、Sheencouragesthemantodowhateverhe
Largecompaniesneedawaytoreachthesavingsofthepublicatlarge.Thesameproblem,【B1】______,facespracticallyeverycom
A、Suegotpromoted.B、Johnhadtoquithisjob.C、BothJohnandSuegotaraise.D、Suefailedtocompleteherproject.A录音结尾提到,职
Thehealth-careeconomyisfilledwithunusualandevenuniqueeconomicrelationships.Oneoftheleastunderstoodinvolvesthe
随机试题
_______能保持汽车在制动时,尤其是在冰雪及泥泞路面上转向的操纵性,防止汽车失控。
特发性血小板减少性紫癜之血热伤络证的治法是
患者,男,65岁,农民,小学文化。胃癌术后第1天,护士就减轻术后疼痛的方法与其进行交谈时,恰逢患者的亲属探望。此时患者感到伤口阵阵疼痛,略显烦躁,导致交谈难以继续。影响此次护患沟通的隐秘因素是
()的特点是单价是确定的,工程量是可变的。
机电工程资料按工作任务分类,可分为输人类、输出类、上报审批类、下发传达类、()、报废销毁类等。
绿色植物在生物圈中的水循环中起着重要的作用,主要是因为它具有()。
在现代市场体系的分类中,生产要素市场中的技术市场又可以分为()。
石墨烯材料是近年来发现的新材料,下列关于石墨烯的说法错误的是:
WelchePluralformstimmtnicht
Ifwecan______ourpresentdifficulties,theneverythingshouldbeallright.
最新回复
(
0
)