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
专升本
Humanity is a new experiment on planet Earth. For most of its history, life on Earth was restricted to the sea. Living things be
Humanity is a new experiment on planet Earth. For most of its history, life on Earth was restricted to the sea. Living things be
admin
2008-12-30
99
问题
Humanity is a new experiment on planet Earth. For most of its history, life on Earth was restricted to the sea. Living things began to populate the land slightly over 400 million years ago. And humans have existed for no more than 3 million years.
One way to represent the evolution of life is to compress the 4. 6-billion-year history of Earth into a 1-year-long film. In such a film, Earth forms as the film begins on January 1, and through all of January and February it cools and is cratered(变成坑状) and the first oceans form.
But those oceans remain lifeless until sometime in March or early April, when the first living things develop
. The 4-billion-year history of Precambrian (前寒武纪) evolution lasts until the film reaches mid-November, when primitive ocean life begins to evolve into complex organisms such as trilobites(三叶虫).
If we examine the land instead of the oceans, we find a lifeless waste. But once our film shows plant and animal life on the land, about November 28, evolution proceeds rapidly. Dinosaurs, for example, appear on about December 12 and vanish by Christmas Eve, as mammals (哺乳动物) and birds flourish.
Throughout the 1 -year-run of our film there are no humans, and even during the last days of the year as the mammals rise and dominate the landscape, there are no people. On the early evening of December 31, vaguely human forms move through the grasslands, and by late evening they begin making stone tools. The Stone Age lasts until about 11:45 p. m. , and the first signs of civilization, towns and cities, do not appear until 11:54 p. m. The Christian era begins only 14 seconds before the New Year, and the Declaration of Independence is signed with one second to spare.
In comparing all of Earth’s geological evolution to one calendar year, the author shows
选项
A、just how recently humanity has arrived on the scene
B、just how simple it is to understand the history of Earth
C、just how early humanity appears on planet Earth
D、just how difficult it is to understand the history of Earth
答案
A
解析
由文章第一、二段可知,人类是300万年前出现的,而地球上的生命变革是46亿年前的事了,故选A。
转载请注明原文地址:https://kaotiyun.com/show/VjLC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Since1950s,thecomputerindustryhas______.Althoughcomputersareusedinalmosteveryaspectsofbusiness,theycan’trepl
TherewasthePuritan(清教徒)beliefinthevirtueofwork,bothforitsownsakeandbecausetherewardsitbroughtwereregarded
Ahobbycanbealmostanythingapersonlikestodoinhissparetime.Hobbyists【B1】______pets,buildmodelshipsanythingap
Shedecidedto______inthehistorycourseatthelocaleveningschool.
Historianscan’ttelluswhen,whereor【71】thefirstfoodwascooked.Inearliest【72】whenpeoplehadeatentheirfood【73】,
Nosoonerhadthethiefdisappearedintoasidestreet______.
Idon’tremembertheboiler______duringtheseyears.
Idon’tknowtheman______youaretalkingabout.
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Likemostpeople,Iwasbroughtuptolookuponlifeasaprocessofgetting.ItwasnotuntilinmylatethirtiesthatImadet
随机试题
宋初保甲制度的核心功能是负责强化()
某企业有关损益的资料及经济业务如下:(1)2014年6月30日的部分科目余额如下所示:(2)6月30日,结转本月销售成本1340万元,并结转本月损益。要求:根据资料编制6月份利润表。
扩展v.e________
急进性肾小球肾炎主要的病理改变为
A.羟丙基甲基纤维素B.甲基纤维素C.醋酸纤维素D.微晶纤维素E.邻苯二甲酸醋酸纤维素属于水不溶型包衣材料的是()。
案例2014年,G淀粉公司雇佣临时人员把仓库改造成第三生产车间。该车间为长80m、宽50m、高15m的框架砖混结构建筑,分成打包间和产品暂存间。打包间用7m高砖墙与暂存间分隔。打包间内有打包机8台、振动筛8台。振动筛安装在6m高的二层
航显系统可支持IT操作管理系统在远端对系统运行状态进行监控。系统运行状态包括()的运行状态。
《建筑材料及制品燃烧性能分级》(GB8624—2012)与《建筑材料及燃烧性能分级》(GB8624—2006)对建筑内部装修材料按燃烧性能划分级对应关系的描述,正确的是()。
“根据组织的使命而提出的组织在一定时期内所要达成的预期效果”称为()。
计算机病毒可以使整个计算机瘫痪,危害极大。计算机病毒是______。
最新回复
(
0
)