首页
登录
职称英语
What are the chances that we will encounter some alien form of life, as we ex
What are the chances that we will encounter some alien form of life, as we ex
游客
2025-04-25
30
管理
问题
What are the chances that we will encounter some alien form of life, as we explore the galaxy. If the argument about the time scale for the appearance of life on Earth is correct, there ought to be many other stars, whose planets have life on them. Some of these stellar systems could have formed 5 billion years before the Earth. So why is the galaxy not crawling with self designing mechanical or biological life forms? Why hasn’t the Earth been visited, and even colonized. I discount suggestions that UFOs contain beings from outer space. I think any visits by aliens would be much more obvious, and probably also, much more unpleasant.
What is the explanation of why we have not been visited?
One possibility is that the argument about the appearance of life on Earth is wrong. Maybe the probability of life spontaneously appearing is so low that Earth is the only planet in the galaxy, or in the observable universe, in which it happened.
Another possibility is that there was a reasonable probability of forming self-reproducing system, like cells, but most of these forms of life did not evolve intelligence.
A third possibility is that there is a reasonable probability for life to form, and to evolve to intelligent beings, in the external transmission phase. But at that point, the system becomes unstable, and the intelligent life destroys itself. This would be a very pessimistic conclusion. I very much hope it isn’t true.
I prefer a fourth possibility: there are other forms of intelligent life out there, but we have been overlooked. There used to be a project called SETI, the search for extraterrestrial intelligence. It involved scanning the radio frequencies, to see if we could pick up signals from alien civilizations. I thought this project was worth supporting, though it was cancelled due to a lack of funds. But we should have been wary of answering back, until we have developed a bit further. Meeting a more advanced civilization, at our present stage, might be a bit like the original inhabitants of America meeting Columbus. I don’t think they were better off for it. [br] What does the word "discount" (line 6, Para. 1) most probably mean according to the context?
选项
A、Doubt
B、Accept
C、Discharge
D、Disregard
答案
A
解析
联系上下文,“discount”(line 6,Para.1)的意思应该是“怀疑”,“不全信”。
转载请注明原文地址:http://tihaiku.com/zcyy/4053184.html
相关试题推荐
Whatarethechancesthatwewillencountersomealienformoflife,asweex
Whatarethechancesthatwewillencountersomealienformoflife,asweex
Oneofthemostdifficultsituationsthataresearchercanencounteristos
Oneofthemostdifficultsituationsthataresearchercanencounteristos
Oneofthemostdifficultsituationsthataresearchercanencounteristos
Thechancesofarepetitionofthoseunfortunateeventsare______indeed.A、dista
IntheartoftheMiddleAges,weneverencounterthepersonalityoftheart
IntheartoftheMiddleAges,weneverencounterthepersonalityoftheart
Ifyouareafanofsciencefiction,you’venodoubtencounteredthetermna
Ifyouareafanofsciencefiction,you’venodoubtencounteredthetermna
随机试题
两侧岩层向内相向倾斜,中心部分岩层时代较新,两侧岩层依次变老的是: A.节理
我国的公司登记机关是( )。A.市场监督管理机关 B.国税机关 C.财政部
下列选项中属于内分泌器官的是( )A.甲状腺 B.肾上腺 C.胸腺 D.
六淫中易袭阳位的是()。A.风邪 B.寒邪 C.暑邪 D.湿邪 E
对固定净值型()而言,基金份额价格固定为1元人民币,投资者在申购、赎回货币
假性神经递质引起肝性脑病的机制是A.干扰脑的能量代谢 B.使脑细胞产生抑制性突
我国国家权力机关对行政机关的监督主要是()。 A.法律监督B.专门监督C.
证券市场监管的重点内容有()。A:对证券发行及上市的监管 B:对交易市场的监管
对调节内脏系统活动起重要作用的中枢是()。单选A.底丘脑 B.中脑
A.男性同性恋者 B.新生儿 C.月经期妇女 D.老年女性 E.体弱者播
最新回复
(
0
)