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
2024-04-06
27
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/3543241.html
相关试题推荐
[originaltext]Letmewarnyouagainstamistakethathistoriansofscienceo
[originaltext]Letmewarnyouagainstamistakethathistoriansofscienceo
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodinthe
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseeth
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseeth
[originaltext]Californiaisalandofvarietyandcontrast.Almosteverytyp
[originaltext]Californiaisalandofvarietyandcontrast.Almosteverytyp
[originaltext]Californiaisalandofvarietyandcontrast.Almosteverytyp
[originaltext]VietnameseauthoritiesreportedonMondaythatbirdfluhassp
[originaltext]M:SoJanice,youwerelookingatidentifyingdifferenttalentsi
随机试题
(1)Thereareobviousdifferences,ofcourse.LadyGaga’sraw-meatdresswoul
I’minterestedinthecriminaljusticesystemofourcountry.Itseemstome
Whatarethetwospeakersmainlydiscussing?[br][originaltext]W:Sowheredo
Overseasassignmentsarebecomingincreasinglyimportanttoadvancementwith
()大二学生()学年[br]()事假()硕土C、M
采用一路消防供水且建筑高度大于()m时,应设置消防水池。A.24 B.50
A.几何不变 B.几何可变 C.瞬变 D.超静定结构
管道穿越墙洞、楼板洞应及时安放套管,并用()水泥砂浆或细石混凝土填嵌密实;电线
下列说法正确的是:A.临床用血的包装、储存、运输必须符合国家规定的卫生标准 B
(2021年真题)企业在现金清查中发现现金溢余,属于应支付给有关人员的款项,报经
最新回复
(
0
)