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
Famed for their high-elevation forests, the Appalachian Mountains sweep south from Quebec to Alabama. Highest in New England and
Famed for their high-elevation forests, the Appalachian Mountains sweep south from Quebec to Alabama. Highest in New England and
admin
2014-02-22
64
问题
Famed for their high-elevation forests, the Appalachian Mountains sweep south from Quebec to Alabama. Highest in New England and North Carolina, this broad system covers more than 1, 200 miles to form the rocky backbone of the eastern United States.
The Blue Ridge Mountains form a substantial part, 615 miles, of the far-reaching Appalachians. They begin as a narrow, low ridge in Pennsylvania, then slowly spread and rise until they reach the height of 5, 938 feet at majestic Grandfather Mountain in North Carolina. The Blue Ridge technically includes among its major spurs the Great Smoky Mountains and the Black Mountains; Mount Mitchell, in the latter range, is at 6, 684 feet the highest peak east of the Mississippi River. Like the rest of the Appalachians, these mountains were once substantially higher and bolder. Their uplift was completed some 289 million years ago, and they have been drastically eroded ever since. At one time, immense continental glaciers covered the land as far south as Pennsylvania. Although they did not spread over the Blue Ridge, plants and animals far beyond their reach became adapted to the cold. When the climate warmed and the ice melted, the cold-adapted species retreated northward, surviving in the south only at higher, cooler elevations.
Red Spruces and Fraser firs are remnants of the Ice Age, thriving in the higher elevations of the Blue Ridge; and local belches, birches, and red oaks are typical of forests farther to the north. Sharing the high peaks is another distinctive plant community. This is the "bald" — a treeless area covered with grass, or more commonly, with broad-leaved shrubs. Often large and vigorous, the latter include huckleberries, mountain laurel, and most especially, rhododendron, an evergreen shrub that blossoms in June and creates some of the most spectacular wild gardens on Earth.
According to the passage, the melting of glaciers caused some plant species to______.
选项
A、adapt to the heat
B、die out
C、grow bigger and stronger
D、move northward
答案
D
解析
细节判断题。根据题干关键词the melting of glaciers与原文第二段尾句中的the climate warmedand the ice melted对应,据此定位答案。原句中的retreated northward与选项D对应。故答案为D。
转载请注明原文地址:https://kaotiyun.com/show/UHQO777K
0
考博英语
相关试题推荐
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajor【C1】______toconsidertherole
BritainandSpainhavethehighestproportionofcocaineusersintheEU,accordingtoapan-Europeandrugssurveypublishedtod
BritainandSpainhavethehighestproportionofcocaineusersintheEU,accordingtoapan-Europeandrugssurveypublishedtod
Anareaofrichforestswas______tolife.
InEngland,alongastretchofthenorth-eastcoastwhichgentlycurvesfromNorthumberlandtothemouthoftheriverTees,ther
InEnglandalongastretchofthenorth-easecoastwhichgentlycurvesfromNorthumberlandtotheestuaryoftheriverTees,the
InEnglandalongastretchofthenorth-easecoastwhichgentlycurvesfromNorthumberlandtotheestuaryoftheriverTees,the
(1)TheChinese,fromthehighesttothelowest,haveanimperturbablequietdignity,whichisusuallynotdestroyedevenbyaEu
随机试题
Lifestyleisthewayapersonlives;itincludeswork,leisuretime,hobbies,otherinterests,andpersonalphilosophy.Onepers
胸膜摩擦音听诊的时相特点为
在结构主义盛行的文化背景下,在功利取向为主导的市场经济中,人们缺乏理性向道德妥协的意识,迷信于理性计算,从而使得信仰与道德日渐荒漠化。信仰的缺乏必然造成人无法对生活及生命的意义进行完整解读,缺乏对规则的敬畏,从而导致信仰被理性“杀死”。 作者通过这段文字
合理布置天沟有利于防渗漏和构造处理,以下天沟分界部位哪条错误?
城市环境污染从不同角度、不同方面有多种分类。按污染形态分类有()。
以下各种文件中,属于标底价格组成的是()。
机关游泳池办证的通知机关各直属单位:机关游泳池定于6月1日正式开放,6月10日开始办理游泳证。请你们接此通知后,按下列规定,于五月三十日前到机关俱乐部办理游泳手续。一、办理对象:仅限于你单位干部或职工身体健康者。二、办证方法:
阅读以下文字,完成下列题。基因污染是环保新概念。这个概念的形成和提出具有深远的意义,它反映了人类的预警意识,生物繁殖的本质是基因复制.而基因污染是在天然的生物物种基因中掺进了人工重组的基因。这些外来基因可随被污染生物的繁殖得到增殖。再随被污染生物
[A]Butassixyearsstretchedto10,thento14,theanxietyofhealthofficialsgavewaytoastonishment.Althoughtwoofthe
Peoplegetwellagainbytakingit.Itgivesuslightinthedaytime.
最新回复
(
0
)