首页
登录
职称英语
Of all the problems facing modern astronomers, perhaps the most fascinating
Of all the problems facing modern astronomers, perhaps the most fascinating
游客
2023-07-24
24
管理
问题
Of all the problems facing modern astronomers, perhaps the most fascinating is: "Can intelligent life exist elsewhere?" Since the Earth is an unimportant planet moving round an unimportant star, it would be a pride on our part to suppose that we are the only intelligent beings in the universe. But to obtain proof is difficult.
The main trouble is that our neighbor worlds, the bodies in the Solar system appear to be unsuitable for advanced life-forms. The Moon may be ruled out at once; it has hardly any atmosphere. Venus(金星) is little better; the surface temperature is extremely high and the atmosphere is mostly carbon dioxide. Mars with a very thin atmosphere and a severe shortage of water, may well support simple plant life but there seems no hope of finding animals, while the attractive Martians(火星人) of the story-tellers have long since been given up.
Of course this has not stopped the flow of bright ideas for communicating with the supposed people on Mars. In the early nineteenth century the great mathematician Gauss suggested planting treepatterns in Siberia(西伯利亚), so that the Martians would see them and replay suitably. Following up this idea, the Austrian scientist Karl Littrow proposed digging very wide ditches in the Sahara, triangular in patterns, and then filling them with petrol or some substance so that, when lit, the ditches would present Martian observers with a "flaming triangle" which would show the existence here of intelligent minds. Even better were the plans of Charles Cross, a French writer of the 1870’s, who wanted to build a large mirror to reflect the sun’s rays and concentrate them on the surface of Mars, thereby making a vast burning-glass. By swinging the mirror around, Cross explained it would be practicable to write words in the Martian deserts simply by burning the sand. For many years he bombared(轰击) the French government with literature about this plan and was very disappointed when no official interest was shown. [br] There is unlikely any life on Venus because ______.
选项
A、the surface is too hot
B、the weather is too cold
C、it is severely short of water
D、it has a very thin atmosphere
答案
A
解析
由第二段第三句Venus is little better;the surface temperature is extremely high and the atmosphere is mostly carbon dioxide.可知,金星有两个特点:表面太热和大气主要由二氧化碳构成。而从同一段可以读到Mars with a very thin atmosphere and a severe shortage of water,说明火星特点为:空气稀薄、严重缺水,可排除C)和D),因为这两项是火星的特点;而B)在文中没有提及。
转载请注明原文地址:https://tihaiku.com/zcyy/2865461.html
相关试题推荐
[originaltext]Haveyoueverhadtravelproblemsbecauseyourairplanewasl
[originaltext]Haveyoueverhadtravelproblemsbecauseyourairplanewasl
Itisperhapsthehardestreformofall.Pensionsystemsorenergyshortages
Itisperhapsthehardestreformofall.Pensionsystemsorenergyshortages
Itisperhapsthehardestreformofall.Pensionsystemsorenergyshortages
[originaltext]Agoodmodernnewspaperisanextraordinarypieceofreading.
It’samazingthatinamodern,hugecitylikeNewYork,problemswiththewe
It’samazingthatinamodern,hugecitylikeNewYork,problemswiththewe
It’samazingthatinamodern,hugecitylikeNewYork,problemswiththewe
It’samazingthatinamodern,hugecitylikeNewYork,problemswiththewe
随机试题
A.1<T<5且n>40 B.b+c>40 C.有1/5以上格子中的理论数小
治疗鼻衄热邪犯肺证的最佳选方是A.银翘散 B.沙参麦冬汤 C.泻白散
下列关于大黄保肝、利胆作用机理的叙述,错误的是A.可刺激人体产生干扰素,抑制病毒
在下列软膏剂基质中,在应用温度范围内(-40~150℃)黏度变化极小的是A.凡士
1.有条件就要抓紧享乐,不仅能提高生活质量,还能够刺激消费,拉动经济发展。(
图中一次能源消费量与生产量差值最大的一年,该差值为多少亿吨标准煤?A
培训课程应达到的全部目标分为三个领域,其中不包括( )。A.认知领域 B.情
女性,26岁。10天来全身皮肤出血点伴牙龈出血来诊。化验PLT35×109/
根据《建设工程施工质量验收统一标准》,施工质量验收的最小单位是()。A.单位
男,55岁。因急性阑尾炎穿孔入院。行阑尾切除术后第6天,出现发热,体温上升至39
最新回复
(
0
)