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
57
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
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
随机试题
从不文明到文明,从文明的较低层次向较高层次__________,需要一个过程。从这个角度出发,我们不应一味批评公民素质__________,更当以每一次问题暴露为契机,优化管理方式、加强机制建构,真正从治理现代化的高度推进文明建设。填入画横线部分
A.下斜肌B.上斜肌C.前斜角肌D.甲杓肌E.斜方肌滑车神经支配()
患者,男性,21岁,近半年来反复心悸、胸痛、劳力性呼吸困难,时有头晕或短暂神志丧失。体检发现:心脏轻度增大,心尖部有2级收缩期杂音和第4心音,胸骨左缘第3~4肋间闻及较粗糙的喷射性收缩期杂音。最可能的诊断是()
严禁在隔墙两侧同一部位开槽、开洞,其间距应错开()mm以上。
证券公司的主要业务包括()。
宪法最主要、最核心的价值在于保障公民的基本权利。()
根据下列资料,回答问题。2017年7月,原煤产量2.9亿吨,同比增长8.5%,继续保持较快增长,但比6月回落2.1个百分点;日均生产950万吨,比6月减少78万吨。1—7月,原煤产量20.1亿吨,同比增长5.4%。分地区来看,7月,山
己知某宏观经济中的总量生产函数Y=KαLβ,α+β=1,K和L分别为两种生产要素,他们相应的价格分别为r和w。产出Y的价格为P。(1)写出劳动需求函数。(2)写出总供给函数。(3)设α=β=0.5,K=500,w=25,w
【S1】【S10】
HowtoApproachaDissertationI.WhatisadissertationA.Apieceofwritingwithargument:—analyzetheevidencetosupport
最新回复
(
0
)