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
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the
admin
2010-01-07
30
问题
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the Earth’ s interior. Some geologists thought that it contained a highly compressed ball of incandescent gas, while others suspected that it consisted of separate shells, each made of different materials. Today well over a century later, there is little direct evidence of what lies beneath our feet. Most of our knowledge of the Earth’ s interior comes not from mines or boreholes, but from the study of seismic waves--powerful pulses of energy released by earthquakes.
The way that seismic waves travel shows that the Earth’ s interior is far from uniform. The continents and the seabed are formed by the crust--a thin sphere of relatively light, solid rock. Beneath the crust lies the mantle, a different layer that extends approximately halfway to the Earth’ s center. There the rock is the subject of a battle between increasing heat and growing pressure.
In its high levels, the mantle is relatively cool; at greater depths, high temperatures make the rock behave more like a liquid than a solid. Deeper still, the pressure is even more intense, preventing the rock from melting in spite of a higher temperature.
Beyond a depth of around 2,900 kilometers, a great change takes place and the mantle gives way to the core. Some seismic waves cannot pass through the core and others are bent by it. From this and other evidence, geologists conclude that the outer core is probably liquid, with a solid center. It is almost certainly made of iron, mixed with smaller amounts of other elements such as nickel.
The conditions in the Earth’ s core make it a far more alien world than space. Its solid iron heart is subjected to unimaginable pressure and has a temperature of about 9,000°F. Although scientists can speculate about its nature, neither humans nor machines will ever be able to visit it.
The word "There", the first word in the last sentence of paragraph 2 refers to which of the following?
选项
A、A layer beneath the crust that extends halfway to the Earth.
B、A thin sphere of relatively light, solid rock with high temperature.
C、The continents and the crust that are with both heat and pressure.
D、Earth’ s center where the rock is the subject of battle between heat and pressure.
答案
A
解析
本题为语义判断题,there是用来指代mantle。
转载请注明原文地址:https://kaotiyun.com/show/8uPd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Therearetwobasicwaystoseegrowth:oneasaproduct,theotherasaprocess.Peoplehavegenerallyviewedpersonalgrowtha
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
Amagazineholdsaspecialdiscussionondivorce.Writeanarticletothemagazinetoslateyourownpointofviewondivorcean
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Forachild,happinesshasamagicalnature.Iremembermakinghide-outsinnewly-cuthay,playingcopsandrobbersinthewoods
Forachild,happinesshasamagicalnature.Iremembermakinghide-outsinnewly-cuthay,playingcopsandrobbersinthewoods
Forachild,happinesshasamagicalnature.Iremembermakinghide-outsinnewly-cuthay,playingcopsandrobbersinthewoods
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
WhathavetheEuropeancountriesagreedonattheBrusselsSummit?
随机试题
在小组工作的结束阶段,社会工作者的任务不仅需要处理小组成员的离别情绪,还需要()。
Inouronlinelife,weneedtousepasswordsfrequently.Weusepasswords【C1】______e-mail,gamingsites,socialnetworkingsite
心脏右前斜位摄影,身体冠状面与胶片夹角为
以下关于口腔白斑病恶变倾向,说法不正确的是()
在爆炸压力公式中,当P。=0.1MPa,T。=27℃,T=2411K时,一氧化碳与空气混合物的最大爆炸压力则为()MPa。
某软件公司为增值税一般纳税人,某月销售自行开发生产的中文处理软件产品,销售收入为80万元,假设该纳税人当月允许抵扣的进项税额为3.4万元,则该纳税人当月可以获得即征即退的增值税应退税额为( )。
以下哪项最可能是上述广告所假设的?以下哪项最能说明上述广告存在漏洞?
求=________.
Writeareplytothisbusinessletter.OfficeSuppliesCompanyABCEngineeringCompany,222NathanRoad
PartⅡReadingComprehension(SkimmingandScanning)Directions:Inthispart,youwillhave15minutestogooverthepassageq
最新回复
(
0
)