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
专升本
Unless we spend money spotting and preventing asteroids now, one might crash into Earth and destroy life as we know, say some sc
Unless we spend money spotting and preventing asteroids now, one might crash into Earth and destroy life as we know, say some sc
admin
2011-03-26
43
问题
Unless we spend money spotting and preventing asteroids now, one might crash into Earth and destroy life as we know, say some scientists.
Asteroids are different forms of the meteoroids that race across the night sky. Most orbits the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a violent coming course together with Earth.
Buy $ 50 million worth of new telescopes right now. Then spend $10 mil]ion a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap.
Is it worth it? Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think asteroids big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare but if one did fall it would be the end of the world. "If we don’t take care of these big asteroids, they’ll take care of us. "Says one scientist. "Its that simple."
The cure, though, might be worse than the disease, Do we really want fleets of nuclear weapons silting around on Earth? "The world has less to fear from doomsday rocks than from a great nuclear fleet set against them. "Said a New York Times article.
What does the passage say about asteroids and meteoroids?
选项
A、They are heavenly bodies similar in nature.
B、There are more asteroids than meteoroids.
C、They are heavenly bodies different in composition.
D、Asteroids are more mysterious than meteoroids.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/LYvC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
ThebabywassenttoahospitalinLondonbecause______.Fromthispassageitseemsthatthebaby’sillnesshadsomethingtod
NotuntilMr.SmithcametoChina______whatkindofcountrysheis.
Itoldhimhowtogethere,butperhapsIshouldhavegivenhimamap.
______experienceofworkinginanofficeenvironmentisessentia[forthisjob.
Manyanimalsareusedtohelpscientistsfindcuresfordiseases.Oneofthemostcommonanimalsusedismonkeys,orprimates.T
Memoryistheabilitytokeeptrackofthingsthathavehappenedinthepast.Memoryreallyislearning.Oneneedsmemorytorid
I______myformerschoolteacherwhenIwasshoppingyesterday.
Hisdoctorsuggestedthathe_____ashorttripabroad.
______youobjecttoaman,everythinghedoesiswrong.
Allwhalesfallintotwogroups,thosewithteethandthosewithout.Bothbelugaanddolphinbelongtothesuborderoftoothedw
随机试题
风湿性心脏病心力衰竭服用地高辛13天,出现恶心、呕吐,室性期前收缩二联律,除停用洋地黄外,治疗应首选()
解放思想、实事求是的两个“宣言书”是()
以下哪组症状临床上可诊断为劳力型心绞痛
A.26~42B.60~80C.50~70D.70~120E.70~80健康成年奶牛的正常脉搏频率及变动范围是
款项是作为支付手段的货币资金,主要包括现金、银行存款以及其他视同现金和银行存款使用的()等。
房地实行统一管理的有()等省、市。
国际航空运输承运人对旅客托运行李或者货物的赔偿责任限额,每千克为332计算单位。()
奇遇莫言①1982年秋天,我从保定府回高密东北乡探亲。因为火车晚点,车抵高密站时,已是晚上九点多钟。通乡镇的汽车每天只开一班,要到早晨六点。举头看天,见
来自俄罗斯沃罗涅什林业科学院的科学家们发明了一种新方法,使用这种方法可使普通的劣质木材变得像石头甚至像钢材那样坚硬。这项发明将会使向来在建筑工程中很少使用的木材(如山杨、白桦、白杨和赤杨)今后将不再受人冷落,并能够使它们获得比其它贵重木料更加优质的性能,下
A、It’sMay5.B、It’safinedaytoday.C、It’sMay.D、It’sMonday.D“Whatdayisittoday?”即“今天星期几?”。D选项“It’sMonday.”(今天星期一。)是
最新回复
(
0
)