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
2024-04-02
30
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/3537238.html
相关试题推荐
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodinthe
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseeth
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseeth
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Aspa
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Aspa
[originaltext]Thereareseveralwaysyoucanfindoutaboutthecountriesan
[originaltext]M:SoJanice,youwerelookingatidentifyingdifferenttalentsi
[originaltext]W:MayIhelpyou?M:Yes.Iwouldliketoapplyforoneofthese
[originaltext]W:MayIhelpyou?M:Yes.Iwouldliketoapplyforoneofthese
[originaltext]W:MayIhelpyou?M:Yes.Iwouldliketoapplyforoneofthese
随机试题
IntheBritishMuseumonaSundayafternoon,ancientfaceslookbackatchil
[originaltext]Q:CanIseeyourmenu,please?[/originaltext][originaltext]Q:W
抗震设防烈度为8度,高度为60m,平面及竖向为规则的钢筋混凝土框架-剪力墙结构,
诊断试验的特异性是指( )。A.阴性结果中真阴性者的百分数 B.真阴性占无病
下列关于阿司匹林不良反应的描述,不正确的是A.成瘾性 B.胃肠道反应 C.凝
患儿,5岁。西医诊断为传染性单核细胞增多症,症见发热,皮肤发黄,小便短黄,肝脾肿
《中共中央、国务院关于深化国有企业改革的指导意见》明确,要划分国有企业不同类别,
K线理论更注重短线的操作,它的预测结果只适用于往后很短的时期,有时仅仅是一两天。
按回路正常工作电流选择导体截面时,导体的长期允许载流量应按()进行 修正。A.
根据现行法律法规,建设工程对施工环境管理的基本要求有()。A.应采取生态保
最新回复
(
0
)