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
Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant would in the Earth’s surface, a visitor might assume that
Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant would in the Earth’s surface, a visitor might assume that
admin
2013-05-13
66
问题
Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant would in the Earth’s surface, a visitor might assume that the canyon had been caused by some ancient convulsing (震动). In fact, the events that produced the canyon, far from being sudden and catastrophic, simply add up to the slow and orderly process of erosion.
Many millions of years ago, the Colorado Plateau in the Grand Canyon area contained 1000 more feet of rock than it does today and was relatively level. The additional material consisted of some 14 layered formations of rock. In the Grand Canyon region these layers were largely worn away over the course of millions of years.
Approximately 65 million years ago the plateau’s flat surface in the Grand Canyon area bulged upward from internal pressure, geologists refer to this bulging actions upwading(弯 曲上升); it was followed by a general elevation of the whole Colorado Plateau, a process that is still going on. As the plateau gradually rose, shallow rivers that winded across it began to run more swiftly and cut more definite courses. One of these rivers, located east of the upward, was the ancestor of the Colorado. Another river system, called the Hualapai, flowing west of the upward, extended itself eastward by cutting back into the upward, it eventually connected with the ancient Colorado and captured its waters. The new river then began to carve out the 277-mile-long trench that eventually became the Grand Canyon. Geologists estimate that this initial cutting action began no earlier than 10 million years ago.
Since then, the Canyon forming has been cumulative. To the corrosive force of the river itself have been added other factors. Heat and cold, rain and snow, along with the varying resistance of the rocks, increase the opportunities for erosions. the Canyon walls crumble, the river acquires a cutting tool. Tons of debris, rainfall running off the high plateau creates feeder streams that carve side canyons. Pushing slowly backward into the plateau, the side canyons expose new rocks, and the pattern of erosion continues.
According to the passage how many miles long was the trench that became known as the Grand Canyon?
选项
A、10 100.
B、277.
C、14.
D、10.
答案
B
解析
第三段倒数第二句话说“然后,新的河流开始切割出最后成为大峡谷的长达277英里的壕沟来”,因而本篇作者认为大峡谷长227英里,故选[B]。
转载请注明原文地址:https://kaotiyun.com/show/UVjd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Oneofthebest-knownproverbsmustbe"earlytobed,earlytorise,makesamanhealthy,wealthy,andwise."Thepromisesofhe
Oneofthebest-knownproverbsmustbe"earlytobed,earlytorise,makesamanhealthy,wealthy,andwise."Thepromisesofhe
Text…【C1】______Thanksgivingturkey,it’shardtofind【C2】______"American"food.TheUnitedStatesisalandof【C3】______
Howmanypeopleactuallyshowedupforthemeeting?
WisecompromiseisoneofthebasicprinciplesandvirtuesoftheBritish.Ifacontinentalgreengrocerasks14shillings(orc
IntargetingconsumerswhatPepsicallsthe"PowerofOne"makesperfectsense:it’sallaboutmakingsure.thateverybodywhob
Text…Themessageof【C1】______suchasthisis【C2】______naturalsystemsarecomplex,unpredictable:understandingthem【C3】
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply...allthesewereimportant【C1】______inhelpingEn
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply...allthesewereimportant【C1】______inhelpingEn
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply...allthesewereimportant【C1】______inhelpingEn
随机试题
有关七叶苷水解试验叙述错误的是
胆道疾病首选的辅助检查方法是:
玻璃幕墙立面分格设计,应考虑诸多影响因素,下列哪项不是影响因素?[2003-102]
隧道进洞测量是将洞外的()引测到隧道内,使洞内和洞外建立统一坐标和高程系统。
在Word中,段落缩进包括()。
目前我国开展持续农业工作的重点是()。
许多领导干部都说自己很忙,你担任科级干部之后也可能很忙。请问你如何看待忙的问题?如何在忙的情况下提高自身素质?(某市中层领导职位公开选拔和竞争上岗公共科目考试试题)
Nominally,thisyearshouldbeagoodyearformentalhealth.On13and14April,theWorldHealthOrganization(WHO)andtheWo
ANSI/IEEE1471-2000是对软件密集型系统的架构进行描述的标准。在该标准中,(1)上这一概念主要用于描述软件架构模型。在此基础上,通常采用(2)描述某个利益相关人(Stakeholder)所关注架构模型的某一方面。(3)
如图所示为简单查询向导其中按钮分别代表的意思是
最新回复
(
0
)