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
32
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
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Opinionpollsarenowbeginningtoshowthat,whoeveristoblameandwhateverhappensfromnowon,highunemploymentisprobabl
Whatdoesthespeakermainlydiscuss?
Theaveragepersonseestensofthousandsofimagesaday—imagesontelevision,innewspapersandmagazines,andonthesidesof
EmployeesoftheTaffValeRailwayCompanyinSouthWalesgreasedthetracksandcuttelegraphwiresduringabitterstrikein1
Opinionpollsarenowbeginningtoshowthat,whoeveristoblameandwhateverhappensfromnowon,highunemploymentisprobabl
Genetherapyandgenebaseddrugsaretwowayswecouldbenefitfromourgrowingmasteryofgeneticscience.Buttherewillbeo
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
spring
EveryspringmigratingsalmonreturntoBritishColumbia’sriverstospawn.Andeveryspringnewreportsdetailfreshdisasters
随机试题
什么是证券的β系数?它有什么意义?
一分子葡萄糖完全氧化成CO2与H2O时,产生ATP的分子数是
评标委员会在初评阶段不应淘汰的投标书有( )。
1.背景:某市新建小区雨水管线工程,直径1500mm,长1320m,管顶覆土约4.8m。采用钢筋混凝土管,水泥砂浆抹带接口,90°混凝土基础;施工范围土质为硬塑的轻粉质黏土,无须降低地下水。由于场地狭小,无法采用机械开挖,项目部决定采用人工开挖:
从事建筑活动的企业或单位,应当向()申请设立登记,并由建设行政主管部门审查,颁发资格证书。
罗某,H省Q市R区人,经常居住在该市S区。2013年1月,罗某在L省M市N区窃得他人自行车一辆,价值240元,后被M市公安局查获,M市公安局(位于M市K区)对其处以拘留15天、罚款500元的行政处罚。罗某对行政处罚决定不服,向M市人民政府申请行政复议。M市
2002年12月31日,甲公司按面值100元发行了100万份可转换债券.取得发行收入总额10000万元。该债券的期限为3年,票面年利率为5%,按年支付利息;每份债券均可在到期前的任何时间转换为甲公司10股普通股;在债券到期前,持有者有权利在任何时候要求甲公
在分布式数据库中可将数据库分割成被称为【】的逻辑单位,它们可以被分配到不同站点上进行存储。
AtraintravelsfromBeijingtoTianjinatanaveragerateof40milesperhourinthemorning,andthencomesbackfromTianjin
IntheUnitedStatesthecostoflivinghasbeensteadilyrisingforthepastfewdecades.Foodprices,clothingcosts,housing
最新回复
(
0
)