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
考研
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whet
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whet
admin
2023-02-14
60
问题
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whether these new worlds do indeed have a high probability of hosting new forms of life.
Currently, the best【C1】________on the existence of other planets comes from NASA’s【C2】________Kepler satellite, which has been mapping an area of the sky【C3】________some 150,000 stars.
Scientists estimate that around 5 percent of planets in our galaxy have masses similar【C4】________Earth’s and, possibly, are within the habitable zone of their stars, meaning that【C5】________they hold water it has a high chance of being liquid.【C6】________there are about 200 billion stars in our galaxy alone, scientists estimate that there should be about 10 billion Earth-size planets. Not bad, especially if we【C7】________that to be Earth-size and within a habitable zone is all it takes for life to take hold in an【C8】________world. In practice, however, the situation is much more【C9】________ since it depends on what life is and how it appears in a planet,【C10】________on the planet’s detailed geological history.
Here on Earth life appeared some 3.5 billion years ago.【C11】________that it may have been here as far【C12】________ as 3.8 billion years ago remain tentative. For about the first three billion years, life on earth was【C13】________in the form of single-cell creatures. Only when Earth’s atmosphere was full of oxygen did more sophisticated organisms appear.
【C14】________its unusual atmosphere, Earth’s heavy, single moon, its magnetic field also did something else that allowed complex life to【C15】________on its surface.【C16】________ these, Complex life would find it very hard to【C17】________ and survive.
The results from Kepler’s mission are encouraging and exciting. We have the【C18】________of confirming the existence of countless other worlds out there. Based on these findings, we should indeed【C19】________that other worlds would host some kind of simple life. However, as some scientists argued, Earth and its ability to host complex life will probably remain a【C20】________phenomenon in this and other galaxies.
【C18】
选项
A、risk
B、liberty
C、privilege
D、objective
答案
C
解析
该段第一句谈到来自开普勒太空望远镜项目的结果令人鼓舞和振奋。正是因为开普勒太空望远镜和它所提供的资料,我们才能享有这样的殊荣去求证地外世界的存在。C项privileges“特权,殊荣”符合上下文语义。开普勒太空望远镜的资料和发现应当能提供“确认外星世界存在”的机会和优势。而不应使得我们有证实此事的“风险”(A项risk)和“自由”(B项liberty)。这些研究结果也不会为我们提供 “确认外星世界存在”的目标(D项objective)。
转载请注明原文地址:https://kaotiyun.com/show/exMD777K
0
考研英语二
相关试题推荐
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
随机试题
流行病学
A.胃泌素B.内因子C.免疫球蛋白D.胃蛋白酶原E.生长抑素胃壁细胞分泌的是
下列关于公路工程交工验收目的的表述中,正确的有()。
电气照明工程安装施工时,配管配置形式包括()。
根据下面材料,回答下列题目:假设:无风险收益率为9%,市场资产组合的期望收益率为15%,当前股票市价是100元。对于A公司的股票:β系数为1.2,红利分配率为40%,所宣布的最近一次的收益是每股10元。预计A公司每年都会分红,A公司所有再投资的股权收益率
情报专家巴克斯特在给花草浇水时,脑子里突然出现了一个_______的念头,也许是经常与间谍、情报打交道的缘故,他竟_______地把测谎仪器的电极绑到一株天南星植物的叶片上。结果,他惊奇地发现,当水从根部徐徐上升时,测谎仪上显示出的曲线图形居然与人在激动时
Wherewasthedriverofthesportscarwhentheaccidenthappened?
Tolive,learn,andworksuccessfullyinanincreasing【M1】______complexandinformation-richsociety,studentsmustbeable
Afterheretired,theprofessorlivedin__________(纽约西面的一个小镇上).
Writeashortessaybasedonthepicturebelow.Youshouldstartyouressaywithabriefaccountofpictureandthenexpressyou
最新回复
(
0
)