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
13
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
TheRightAmountofEnergyWeallenjoybeing
TheMissAmericacelebration【C1】______asabeautycontestin1921,butnowp
Today’spolicemeninlargecitiesthroughouttheworld【C1】______onmodeminv
这个车间既做来料加工,也做来样加工。Thisworkshopprocessesrawmaterialsonclient’sdemandandp
“小学生品行养成特点和规律”属于《小学教师专业标准(试行)》“专业知识”维度的(
患者,男性,56岁,肝癌晚期已出现远隔转移,化疗后食欲极差,腹部胀痛,夜间睡眠质
血清中含量最多的IgA.IgMB.IgGC.sIgAD.IgDE.IgE
A.尊重患者的生命价值,确立双向作用的医患关系B.医患关系的间接性、多元性、易变
南方H市环保志愿者小黄觉得自己每天都生活在苦恼中。他和其他志愿者每个月都会上门向
垂直于坝轴线方向的缝称为()。A.纵缝 B.斜缝 C.错缝 D.横缝
最新回复
(
0
)