首页
登录
职称英语
[originaltext] I’m going to pass this piece of amber around so you can see th
[originaltext] I’m going to pass this piece of amber around so you can see th
游客
2023-08-15
34
管理
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、Amber mined from the AppalachianMountains.
B、Amber with no imperfections.
C、Amber containing organic material.
D、Amber with no inclusions.
答案
C
解析
推断题。题目问什么品种的琥珀对于基因研究最有价值,根据最后一句可知是能够提取DNA的。因此,正确答案是C。
转载请注明原文地址:https://tihaiku.com/zcyy/2926981.html
相关试题推荐
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorry.
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorry.
[originaltext]W:Iwanttoregisterforthismathematicscourse.M:I’msorry.
[originaltext](20)Facialexpressionscarrymeaningthatisdeterminedbys
[originaltext](I):(19)TellmemoreabouthowthiscollaborationbetweentheEn
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
[originaltext]Thefamilyischanging.(9)Inthepast,grandparents,parents,
[originaltext]Thefamilyischanging.(9)Inthepast,grandparents,parents,
[originaltext]Thefamilyischanging.(9)Inthepast,grandparents,parents,
随机试题
TheSkillsRequiredtoGetaJobI.Academicskills:ba
[originaltext]Wouldyouliketogotothecinemawithmetonight?[/originaltext
Individualism,independence,andself-relianceareperhapsthemostdistinct
A
目前比较常见的保健食品主要涉及的功能包括( )。A.改善生长发育 B.增强免
中药溶液冷湿敷,适用于A.慢性皮肤炎症,皮损肥厚、苔藓样变 B.有丘疹、鳞屑、
12.实施共建“一带一路”倡议,发起创办亚洲基础设施投资银行,设立丝路基金,举办
定额时间中最主要的组成部分是()。A.作业时间 B.作业宽放时间 C
浅Ⅱ度烧伤创面特征是A.局部红肿 B.局部水疱 C.红白相间 D.焦黄无水
某工程项目施工采用《施工合同条件》,工期为15个月。承包方投标所报工期为13个月
最新回复
(
0
)