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
15
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
WhenwastheAmericanFootballAssociationfounded?
Johnwasinanurseryschoolforoneyear.
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2】
Allinternationalchainschoolsteachmanydifferentlanguages.
Withthewidespreadcomputers,thereisanincreaseinthenumberofpeoplemakinguseofInternet.SomepeoplebelievethatInt
TheBritishphilosopherandlogicianBertrandRusselloncewrote:"Mathematics,rightlyviewed,possessesnotonlytruth,butsu
WhendidMr.Schallerbecomeinterestedinanimals?
Defendersofspecialprotectivelaborlegislationforwomenoftenmaintainthateliminatingsuchlawswoulddestroythefruitso
Whereispopulationgrowthhappening?
随机试题
下列氨基糖苷类抗生素中抗绿脓假单胞菌感染最强的是
患者43岁,子宫次全切除术后6年。4个月前开始出现阴道分泌物增多,黏液水样,且伴有腰部胀痛,尿量可。妇科检查:宫颈结节状,阴道前壁上l,3质硬,双侧主韧带团块状增粗达盆壁;触痛(+),既往无慢性病史。此患者最可能的诊断为:
该工程预付款的起扣点为()万元。在索赔文件中,()是要注意引用的每个证据的效力或可信程度,对重要的证据资料最好附以文字说明或附以确认件。
个人所得税居民纳税人与非居民纳税人的判定标准有( )。
高经营杠杆行业的特征不包括()。
项目经理于2006年3月12日对Y公司的存货进行监盘,监盘中由于恶劣的天气而导致注册会计师无法参与盘点。经测试,Y公司存货的内部控制不健全,A注册会计师根据所选派的 3位农民兄弟实施存货监盘,结果显示盘点日账实相符,据以得出资产负债表日存货真实存在的审计结
有报告指出,今年上半年,国内手机累计销售超过6000万部,其中国产手机共销售2800万部。因此,有媒体判断国产手机复苏了。下列哪一选项如果为真,将有力地支持上述判断?
在网络安全中,截取是指未授权的实体得到了资源的访问权,这是对()。
下列关于内联函数的叙述中,正确的是
如果Excel单元格的值大于0,则在本单元格中显示“已完成”;单元格的值小于0,则在本单元格显示“还未开始”;单元格的值等于0,则在本单元格中显示“正在进行中”,最优的操作方法是()
最新回复
(
0
)