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
Several hundred million years ago, plants similar to modern ferns covered vast stretches of the land. Some were as large as tree
Several hundred million years ago, plants similar to modern ferns covered vast stretches of the land. Some were as large as tree
admin
2017-06-30
41
问题
Several hundred million years ago, plants similar to modern ferns covered vast stretches of the land. Some were as large as trees, with giant fronds bunched at the top of trunks as straight as pillars. Others were the size of bushes and formed thickets of me undergrowth. Still others lived in the shade of giant club mosses and horsetails along the edges of swampy lagoons where giant amphibians swam.
A great number of these plants were true ferns, reproducing themselves without fruits or seeds. Others had only the appearance of ferns. Their leaves had organs of sexual reproduction and produced seeds. Although their "flowers" did not have corollas these false ferns(today completely extinct)ushered in the era of flowering plants. Traces of these floras of the earliest times have been preserved in the form of fossils. Such traces are most commonly found in shale and sandstone rocks wedged between coal beds.
Today only tropical forests bear living proof of tile ancient greatness of ferns. The species that grow there are no longer those of the Carboniferous period, but their variety and vast numbers, and the great size of some, remind us of the time when ferns ruled the plant kingdom.
Which of the following is NOT mentioned as a characteristic of the plants described in the passage?
选项
A、They once spread over large areas of land.
B、They varied greatly in size.
C、They coexisted with amphibians, mosses, and horsetails.
D、They clung to tree trunks and bushes for support.
答案
D
解析
排除题。第一段第一句就交待了A选项,选项B在第一段第一、二句话可知它们的体积有很大的,也有很小的;第一段最后一句话证实了C选项(他们与两栖动物、苔、马尾共生)是对的。
转载请注明原文地址:https://kaotiyun.com/show/sSFO777K
0
考博英语
相关试题推荐
Evenplantscanrunafever,especiallywhenthey’reunderattackbyinsectsordisease.Butunlikehumans,plantscanhavethei
Thehumanbraincontains10thousandmillioncellsandeachofthesemayhaveathousandconnections.Suchenormousnumbersused
Thegreatchariotofsociety,whichforsolonghadrundownthegentleslopeoftradition,nowfounditselfpoweredbyaninterna
Ahundredyearsagoitwasassumedandscientifically"proved"byeconomiststhatthelawsofsocietymakeitnecessarytohave
ThegravitationalpulloftheEarthandmoonisimportanttousasweattempttoconquermoreandmoreofouter-space.Here’swh
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,theCrimeandJusticenetworksponsoredaforumonth
Notallpersonsarrestedand______withacrimeareguilty,andthemainfunctionofcriminalcourtsistodeterminewhoisguil
Technically,anysubstanceotherthanfoodthataltersourbodilyormentalfunctioningisadrug.Manypeoplemistakenlybelieve
Technically,anysubstanceotherthanfoodthataltersourbodilyormentalfunctioningisadrug.Manypeoplemistakenlybeliev
随机试题
城上斜阳画角哀,________。(陆游《沈园二首》)
计算,D:π2≤x2+y2≤4π2.
急性特发性血小板减少性紫癜出血症状的特点是
急性胰腺炎患者发病之初的3~4小时,最有诊断价值的是
下列属于药品的是
下列各句没有语病的一项是()。
菲律宾海战
列宁称马克思、恩格斯是“19世纪人类三个最先进国家中三种主要思潮的继承人和天才的完成者”。这里“三个最先进国家”指的是()。
(上海财大2013)某公司正考虑如下的投资方案,请计算该投资方案的平均会计收益率。
California,bysomemeasuresAmerica’smost【C1】______state,isatthesametimeitsmostagriculturalstate【C2】______totalfar
最新回复
(
0
)