9.The next time someone asks you where the biggest ocean is,point them toward Jupiter.While earth harbours about 320million cubic miles(1,333cubic km)of water,our planet is practically a desert compared to the rest of the Solar System.
A moon of Jupiter called Europa,for example,which is roughly the size of our own Moon,likely hides a subsurface ocean with more than twice as much water as there is on Earth.
Yet even that pales into insignificance in comparison to Europa's neighbour Ganymede; more than 30times as much water as our home planet is thought to reside there as liquid and ice.
And scientists keep finding more water wherever they look.On September 28,researchers reported that Dione---a small moon of Saturn---probably has a subsurface ocean,too.
To see just how Earth stacks up against other ocean worlds,Business Insider contacted Steve Vance,a planetary scientist at NASA's Jet Propulsion Laboratory who's calculated the numbers on just how much water might be out there.
In order of how much water they have,from the least to the most,they are:Enceladus,Dione,Earth,Europa,Pluto,Triton,Callisto,Titan,and Ganymede.Mimas,a moon of Saturn,and Ceres,the largest asteroid in the Solar System,are also thought to have subsurface oceans---but scientists aren't yet sure how big each one might be.
21.How many stars are mentioned in this passage?D
A.Eleven
B.Twelve
C.Thirteen
D.Fourteen
22.What can we know according to the passage?B
A.Compared with the Solar System,Jupiter looks as if it is a desert
B.Ganymede is thought to be covered with more water than Europa
C.Business Insider is a planetary NASA's laboratory of Steve Vance
D.Ceres harbours the largest subsurface ocean in the Solar System
23.What does the passage mainly tell us?D
A.The order of how much water the stars have has been figured out
B.Scientists keep exploring more water in the universe wherever they look
C.These ocean worlds reveal just how little water we have on Earth
D.NASA's planetary scientists are calculating the water numbers in the sky.
分析 本文介紹了美國宇航局的行星科學家們正在計算太空中行星上水的數(shù)量.
解答 21.D.細節(jié)理解題.由全文內(nèi)容可知,第一段的Jupiter,第二段的 Europa,第三段的Ganymede和最后一段的Enceladus,Dione,Earth,Europa,Pluto,Triton,Callisto,Titan,Ganymede.Mimas,Ceres,共有14顆行星,故選D.
22.B.細節(jié)理解題.由第二段likely hides a subsurface ocean with more than twice as much water as there is on Earth,可知 Europa水量是地球上的兩倍多,第三段more than 30times as much water as our home planet is thought to reside there as liquid and ice,可知Ganymede上的水是地球的30倍多,因此Ganymede上的水比Europa多,故選B.
23.D.主旨歸納題.本文主要講述了美國宇航局的行星科學家們正在計算太空中行星上水的數(shù)量并舉出了一些行星的例子,故選D.
點評 本篇文章專業(yè)詞語較多,增加了閱讀難度.考生平時可以有意識地從報刊雜志上找一些較難的閱讀材料來閱讀,以培養(yǎng)自己迎難而上的心理素質(zhì).