首页
登录
职称英语
[originaltext] The ordinary raindrop is a mighty earthmover with sufficient
[originaltext] The ordinary raindrop is a mighty earthmover with sufficient
游客
2023-09-12
31
管理
问题
The ordinary raindrop is a mighty earthmover with sufficient strength to cut rock. When rainwater collects on the surface of the ground, some of it evaporates and some of it sinks into the earth. The remainder begins to flow downhill, commencing its lengthy journey from brook to stream to lake, or to a river that will carry it to the sea.
As water flows along the ground, it picks up sand, pebbles, even boulders. It uses them to gnaw at the sides and bottoms of its channel, gradually loosening more earth.
By this process enormous amounts of mud and rock are moved from the land to the sea. Each year the Mississippi River carries 730 million tons of solid matter into the Gulf of Mexico.
This constant hauling of land into the sea is lowering the United States’ average height above sea level at a rate of about one foot every 9,000 years. If erosion continues at the same rate, the United States will be worn completely down to sea level in about 23 million years.
What does erosion by water result in?
选项
A、It is being raised each year.
B、It remains constant.
C、It will reach sea level in 9,000 years.
D、It is being lowered gradually.
答案
D
解析
细节辨别题 文中讲到美国的平均海拔高度在以每9000年一英尺的速度下降。
转载请注明原文地址:https://tihaiku.com/zcyy/3008442.html
相关试题推荐
[originaltext]The22ndofNovember1970isadaythatthreeBritishsoldier
[originaltext]Amanoncesaidhowuselessitwastoputadvertisementsint
[originaltext]TheOlympicGamesoriginatedin776B.C.inOlympia,asmall
[originaltext]TheOlympicGamesoriginatedin776B.C.inOlympia,asmall
[originaltext]M:Hi,Cathy.IamherebecauseIvisitedcavesalloverNorthAm
[originaltext]M:Hi,Cathy.IamherebecauseIvisitedcavesalloverNorthAm
[originaltext]M:Excuseme,Prof.Thomson.Iknowyourofficehoursaretomorro
[originaltext]M:Excuseme,Prof.Thomson.Iknowyourofficehoursaretomorro
[originaltext]Throughtheyearsofbeinganadvisorattheuniversity,I’ve
[originaltext]Throughtheyearsofbeinganadvisorattheuniversity,I’ve
随机试题
ThesearchforacheapalternativefuelhasledAmericanscientiststostudythe
【S1】[br]【S17】A、almostB、quiteC、stillD、yetC语义衔接题。上句提到perhapslater,此处也提到late
Whichofthefollowingpoetsisdifferentfromtheothers?A、JohnDonne.B、JohnK
采用一阶差分模型一阶线性自相关问题适用于下列哪种情况()。A.ρ≈0 B.ρ
呈扁圆柱形,密被覆瓦状排列的肉质鳞片的药材是A..锁阳 B..青蒿 C..石
成人门静脉高压症继发食管胃底静脉曲张破裂大出血,最常见的并发症是( )。A.失
某孕妇,胎方位为右枕前,在孕妇腹壁上听诊胎心音,最清楚的部位可能在脐()。A.
乳牙环状龋多位于A:牙冠切1/3处 B:牙冠中1/3至颈1/3处 C:牙冠切
工程咨询单位在试运行阶段的质量管理工作主要包括()。A.审查勘察纲要编制情
根据《房屋建筑与装饰工程计量规范》(GB50854-2013)的规定,下列各项费
最新回复
(
0
)