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
2019-10-03
74
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、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/s5W7777K
0
大学英语六级
相关试题推荐
A、Theyhiredsomeonetostayintheirhome.B、Theylefttheirpetswiththeirneighbors.C、Theyrentedtheirhousetoastudent.
自行车曾经是中国城乡最主要的交通工具,中国一度被称为“自行车王国”。如今,随着城市交通拥堵和空气污染日益严重,骑自行车又开始流行起来。近来,中国企业家将移动互联网技术与传统自行车结合在一起,发明了一种称为共享单车(sharedbikes)的商业模式。共享
Peoplecannowavoidhavingtosortthroughalbumsfromseveraldifferentfriendswhentryingtoreliveparties,weddingsandot
IwenttoaCatholicboysschoolinBlackpoolintheNorthofEngland.InmyfirstyearintheseniorschoolIwasanerdykid,
Memoryappearstobestoredinseveralpartsofthelimbic(边缘的)systemofthebrain,andanyconditionthatinterfereswiththef
Thenumberofexecutivebranchemployeesretiringthisfiscalyear,whichendsnextmonth,isontracktobenearlytwicetheto
Smokersinthe"landofthefree"arefindingthemselvesincreasinglylessfreetopursuetheirhabit.NewYorkCityofficialsa
A、Afitnessprogramofferedtothegeneralpublic.B、Aphysicalexercisetobuildupmuscles.C、Aprogramthatmakespeoplekeep
EatingOurYoung[A]AtFeltonvilleSchoolofArtsandSciences,amiddleschoolinapoorneighborhoodofPhiladelphia,thescho
WhyhascrimeintheU.S.declinedsodramaticallysincethe1990s?Economistsandsociologistshaveofferedabountyofreas
随机试题
简述设置行政执法类职位的意义。
急性肾小球肾炎起病的第一症状常为
阅读《张中丞传后叙》中的一段文字,回答问题。当二公之初守也,宁能知人之卒不救。弃城而逆遁?苟此不能守,虽避之他处何益?及其无救而且穷也,将其创残饿羸之余,虽欲去,必不达。二公之贤,其讲之精矣!守一城,捍天下,以千百就尽之卒,战百万日滋之师,蔽遮江
关于肩胛上神经及其阻滞的描述,错误的是
采用湿作业法施工时,石材应进行()背涂处理。
行政处分的对象主要是指()。
某人持有一份160万美元的股指现货,现对其持有的40%进行套期保值,他选择了3份6个月期的股指期货(400点,每点500美元)进行套期保值,则套期保值比率是()。
罗森塔尔效应反映了教育者在思想品德教育过程中必须遵循()原则。
ThefirstPuritanscametoAmericaontheship().
•Lookatthestatementsbelowandapassageaboutleadershipontheoppositepage.•Whichsection(A,B,C,orD)doeseachstat
最新回复
(
0
)