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
21
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
[originaltext]W:Mr.Stern,mayIaskyou?Doyouthinkitwasnecessaryandfa
评价研究问题的判断依据是()A.选题是否合理 B.是否参考足够的
被世界公认为摄影术诞生的年代是()A.1826年 B.1831年 C.18
()根据表演的需要恰当地利用舞台空间创造出最适合表演者演出的空间环境和视觉
患儿,男,6岁。肥胖臃肿,消谷善饥,肢体困倦,头胀眩晕,懒言少动,大便秘结,舌苔
在进行新建商品房销售前,除了准备好销售资料,还需要准备好正式发售方案,发售方案应
在处理劳动争议时,如果没有准确适用的法律条款,()可以选择适用。A:劳动法的首要
在证券组合完全负相关的情况下,可获得无风险组合。()
下列不属于合规管理的重点内容的是()。A:建设强有力的合规文化B:建立符合政策
含有结晶水的矿物药是A.辰砂 B.自然铜 C.雄黄 D.石膏 E.炉甘石
最新回复
(
0
)