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
Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size fro
Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size fro
admin
2010-07-06
34
问题
Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size from microscopic structures to dinosaur skeletons and complete bodies of enormous animals. Skeletons of extinct species of human are also considered fossils.
An environment favorable to the growth and later preservation of organisms is required for the occurrence of fossils. Two conditions are almost always present: The possession of hard parts, either internal or external, such as bones, teeth, scales, shells, and wood; these parts remain after the rest of the organism has decayed. Organisms that lack hard parts, such as worms and jelly fish have left a meager geologic record. Quick burial of the dead organism, so that protection is afforded against weathering, bacterial action, and scavengers.
Nature provides many situations in which the remains of animals and plants are protected against destruction. Of these, marine sediment is by far the most important environment for the preservation of fossils, owing to the incredible richness of marine life. The beds of former lakes are also prolific sources of fossils. The rapidly accumulating sediments in the channels, floodplains, and deltas of streams bury fresh-water organisms, along with land plants and animals that fall into the water. The beautifully preserved fossil fish from the Green River soil shale of Wyoming in the western Unit- ed States lived in a vast shallow lake.
The frigid ground in the far north acts as a remarkable preservative for animal fossils. The woolly mammoth, a long-haired rhinoceros and other mammals have been periodically exposed in the tundra of Siberia, the hair and red flesh still frozen in cold storage.
Volcanoes often provide environments favorable to fossil preservation. Extensive falls of volcanic ash and coarser particles overwhelm and bury all forms of life, from flying insects to great trees. Caves have preserved the bones of many animals that died in them and were subsequently buried under a blanket of clay or a cover of dripstone. Predatory animals and early humans alike sought shelter in caves and brought food with them to the eater, leaving bones that paleontologists have discovered.
Which of tile following is LEAST likely to be found as a fossil, assuming that all are buried rapidly ?
选项
A、a dinosaur.
B、a woolly mammoth.
C、a human ancestor.
D、a worm.
答案
C
解析
本题是一个推断题,文章中的对应表述在倒数第二段。文章中倒数第二段提到了“all forms of life”,因此ABD 都没有理由排除。但是C:人类祖先这一项在最后一段进行了特别的说明,因此可以推测作者在这以前的表述中是没有考虑人类的,因此答案选C.
转载请注明原文地址:https://kaotiyun.com/show/NpJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Waterisakindofchemicalsubstance.
Aslongasherparentscanremember,13-year-oldKatieHarthasbeentalkingaboutgoingtocollege.Hermother,Tally,afinanc
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Writeanarticletitledas"KnowledgeEconomy".Youshouldwriteitaccordingtothefollowingoutline.Outline:(1)Anewkno
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2】
Allinternationalchainschoolsteachmanydifferentlanguages.
TheAmundsen-ScottSouthPoleStationmadeheadlinesinAprilwhenthedoctorforthatremotesciencefacilitywastakenserious
TheissueofonlineprivacyintheInternetagefoundnewurgencyfollowingtheSept.11terroristattacks,sparkingdebateover
Whereispopulationgrowthhappening?
spring
随机试题
以下选项中,不属于其他货币资金的是()
A.X线检查无明显变化B.干骺端增宽,临时钙化带模糊不清,呈毛刷状、杯口状改变C.长骨粗短,弯曲,干骺端膨大呈喇叭状,轮廓光整D.临时钙化带重新出现,渐趋整齐、致密,骨质密度增加E.骨化中心延迟出现佝偻病激期
磙子从动件盘形凸轮机构的基圆半径rmin是()上的最小向径。A.实际轮廓B.理论轮廓C.偏距圆D.辊子
一般资料:求助者,男性,28岁,医院主治医师。案例介绍:求助者在大学时与同学谈恋爱,计划毕业后结婚。但毕业后女友出国留学,结婚的事就耽误了下来。四年来女友不断催促他出国,可他放不下自己在国内某著名医院的工作和发展机会,反而力劝女友回国发展,遂与女
Today,peopleallovertheworldaremovingoutofsmallvillagesinthecountrytogoandliveinbig,noisycities.Theyarem
一家企业招了15名大学生,规定见习期没有工资,但承诺见习期满后转正每人每月5000元,但是见习期满了公司把学生全部辞退了,大学生情绪非常激动,向政府有关部门反映,有关部门让你处理此事,你怎么处理?
什么是数量估计法?
Linux内核主要由5个子系统组成,下面选项中不属于这5个子系统的是()。
ThewaypeopleintheUStraveltoandfromworkhaschangedalotinthelastfiftyyears.【T1】BeforetheSecondWorldWar,most
Oldpeoplearealwayssayingthattheyoungarenotwhattheywere.Thesamecommentismadefromgenerationto【C1】______andit
最新回复
(
0
)