首页
登录
职称英语
Scientists are interested in Mars because_______________. [originaltext] Sci
Scientists are interested in Mars because_______________. [originaltext] Sci
游客
2023-11-23
81
管理
问题
Scientists are interested in Mars because_______________.
Science-fiction writers have often imagined human beings going to live on Mars. But these days scientists are taking the idea seriously. It has a great deal to recommend it since it might solve the problem of overcrowding on the earth. But obviously it would not be worth making the effort unless people could live there naturally. If the atmosphere were like that of the earth, this might be possible. But in fact, it’s mostly carbon dioxide. Apart from that, there are other problems to be overcome. For example, the temperature would have to be raised from 60 below zero to 15 above it. Scientists who study Mars have let out the programme that they can follow. To begin with, they will have to find out whether life has ever existed on the planet Mars in the past. Secondly, they will have to make a reliable map of its surface and finally they will have to make a list of the gases. Above all, they will have to discover how much nitrogen it possesses, since nitrogen is four-fifths of the air we breathe. They are surprisingly optimistic about raising the temperature on Mars and believe it could be done in 200 years. It would take a bit longer, though, to transform the atmosphere so that human beings could live there. Scientists estimate that this will take 100,000 years.
选项
A、people might have to migrate there someday
B、people could live there naturally
C、life has ever existed there
D、its atmosphere is quite different
答案
A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3213199.html
相关试题推荐
PassageTwo[br]Whyis"Gettingjustthegist"soimportant?Becauseitcan
PassageThree[br]Whyarethecontrolsofamoderncarcriticized?Becauset
PassageThree(1)Don’talwaysbelievewhatscientistsandotherauthori
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
Culturesaredifferentbecausethelocationstheyexistinarediff
随机试题
ThatLouiseJohannesisbelievedbymanycriticstobethegreatesttwentiet
ConsideringhowjazzistranscribedinChinese(jueshi),youmaybe【C1】______in
[originaltext]M:Sheila,you’reoneofthespeakersfortheEnglishSpeakingCo
有关费用项目计取的审查要注意的方面不包括()。A.措施费的计算是否符合有关
患者男。65岁,慢性阻塞性肺气肿10余年,为改善透气状况,患者坚持做腹式呼吸锻炼
A.少阴经B.阳明经C.少阳经D.太阳经E.厥阴经与头痛,痛在两侧者有关的经脉是
在混凝土分缝面上出现的剪应力很小,使坝体能保持较好的整体性的是( )。 A、
格列齐特(达美康)的降糖作用机制正确的是A.促进葡萄糖氧化和酵解 B.妨碍葡萄
会分字客学字客所额尝分A.1 B.2 C.3 D.4
频率为100Hz,传播速度为300m∕s的平面简谐波,波线上两点振动的相位差为则
最新回复
(
0
)