首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Its amber contains numerous fossils. B、Its amber is the most durable. C、Its amber is opaque. D、It is the site of the oldest am
A、Its amber contains numerous fossils. B、Its amber is the most durable. C、Its amber is opaque. D、It is the site of the oldest am
admin
2018-02-13
111
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、Its amber contains numerous fossils.
B、Its amber is the most durable.
C、Its amber is opaque.
D、It is the site of the oldest amber deposits.
答案
A
解析
细节题。根据Because it has a great many inclusions,something likes one insect inclusion for every one hundred pieces.可知,多米尼加是琥珀的重要产地,多米尼加有大量的化石,每一百片里就有一片含有昆虫的化石。inclusions的意思是“物质、夹杂物”在此联系上下文译为化石。因此,正确答案是A。
转载请注明原文地址:https://kaotiyun.com/show/G1T7777K
0
大学英语六级
相关试题推荐
Aristotledefinedafriendas"asinglesouldwellingintwobodies".MembersofFacebookwhose"friends"reachtriplefiguresm
Anewstudyfindsthatevenmildstresscanaffectyourabilitytocontrolyouremotions.AteamofneuroscientistsatNewYork
Whilethemissionofpublicschoolshasexpandedbeyondeducationtoincludesocialsupportandextra-curricularactivities,the
Whilethemissionofpublicschoolshasexpandedbeyondeducationtoincludesocialsupportandextra-curricularactivities,the
泼水节(Water-SplashingFestival)是傣族(theDaiminority)最隆重的传统节日。它一般在阳历(thesolarcalendar)的四月中旬,通常是在清明节(theTomb-sweepingDay)10天之前或之后
A、Becauseshebelievedstronglyinthevalueofreading.B、BecauseshewasanEnglishteacherandherownchildrenhadreadalo
A、Buyanewwatch.B、Gotobedearlier.C、Seeadoctor.D、Changehisjob.B推理题。从对话中可以得知男士将在下周结束课题的研究,可以恢复到正常的作息,由此可以判断他可能会早点上床入睡
A、Itwassetupasawholesaler25yearsago.B、Itsoldcampingequipmentoriginally.C、Itbeganofferingholidays10yearsago.
AreyourFacebookfriendsmoreinterestingthanthoseyouhaveinreallife?Hashigh-speedInternetmadeyouimpatientwithslo
A、Ifshechangesclasses.B、Ifthebooksareused.C、Ifshewantstosellthem.D、Ifthebooksareneededbyothers.A男士说如果女士改变课
随机试题
Ourdreamistosucceed/togetsuccess/toachievesuccesswithoutworkinghard.
A.亚胺培南西司他丁B.美罗培南C.厄他培南D.氨曲南E.左氧氟沙星可用于肺炎链球菌、流感嗜血杆菌、卡他莫拉菌所致社区获得性肺炎的是
“家校携手,共育其子”的理念,侧面反映了家庭教育的()
利多卡因用于表面麻醉的浓度是利多卡因用于局部浸润麻醉的浓度是
农民集体所有的土地依法用于非农业建设的,由()登记造册,核发证书,确认建设用地使用权。
【背景资料】某水利枢纽工程由电站、溢洪道和土坝组成。主坝为均质土坝,上游设干砌石护坡,下游设草皮护坡和堆石排水体,坝顶设碎石路。工程实施过程中发生下述事件:事件一:项目法人委托该工程质量监督机构对于大坝填筑按《水利水电基本建设工程单元工
根据民法基本理论的规定,民事法律行为成立的实质要件是:行为人()。(2007年)
某企业管理层拟将该公司旗下的两家子公司合并以实现业务重组,致使这两家子公司的大部分员工面临工作环境改变甚至下岗的风险。这些员工联合起来进行了坚决的抗争,致使公司管理层放弃上述决定。公司员工对待和处理这场冲突的策略是()。
某公司可通过电台及报纸两种方式做销售某种商品的广告,根据统计资料,销售收入R万元与电台广告费x1万元及报纸广告费用x2万元之间的关系有如下经验公式:R=15+14x1+32x2—8x1x2—2x12一10x22.(1)在广告费用不限的情
Plainandsimple,stockisashareintheownershipofacompany.Stockrepresentsaclaimonthecompany’sassetsandearnings.
最新回复
(
0
)