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
82
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
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Evolutionarytheories.TheBelgianGeorgeLemaitreproposedtheideathatabout20,000millionyearsagoallthematterinthe
Evolutionarytheories.TheBelgianGeorgeLemaitreproposedtheideathatabout20,000millionyearsagoallthematterinthe
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Evolutionarytheories,TheBelgianGeorgeLemaitreproposedtheideathatabout20,000millionyearsagoallthematterinthe
WhathavetheEuropeancountriesagreedonattheBrusselsSummit?
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
InwhichyeardoesThanksgivingdatebackto______.
随机试题
生命中最主要的物质基础是()。
以下反映肺换气功能的参数是
A.稽留热B.不规则热C.弛张热D.间歇热E.午后热疟疾的常见热型是
结核性腹膜炎最有价值的检查足
古代学校教育中作为教育内容的“六艺”是指:______、乐、射、御、书、数。
阅读下面这首唐诗,回答问题。醉眠唐庚山静似太古,日长如小年。馀花犹可醉,好鸟不妨眠。世味门常掩,时光簟已便。梦中频得句,拈笔又忘筌。
通过主体调节过程研究自我发展的代表人物是()。
ParkingProblem;Forbiddenin【D1】______percentofstreetsReason:Buildingapartmentsand【D2】______ismoreprofitable,hencefew
Bloggingisapastimeformany,evenalivelihoodforafew.Forsome,itbecomesan【B1】______.Suchbloggersoftenfeelcompel
MessagetoyoungChineseinthe21stcenturyFundamentalSciencehasprovideduswithanincreasinglydetailedandaccurate
最新回复
(
0
)