首页
登录
职称英语
Unless we spend money to spot and prevent asteroids(小行星)now, one might crash
Unless we spend money to spot and prevent asteroids(小行星)now, one might crash
游客
2025-05-01
9
管理
问题
Unless we spend money to spot and prevent asteroids(小行星)now, one might crash into Earth and destroy life as we know it, say some scientists.
Asteroids are bigger versions of the meteoroids (流星) that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands whose orbits put them on a collision course with Earth.
Buy $ 40 million worth of new telescopes right now. Then spend $ 10 million 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 an asteroid big enough to destroy lots of life might strike Earth once every 400, 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’11 take care of us, "says one scientist "It’s that simple. "
The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting a-round on Earth? "The world has less to fear from doomsday (毁灭性的) rocks than from a great nuclear fleet set against them, " said a New York Times article. [br] What do scientists say about the collision of an asteroid with Earth?
选项
A、It is very unlikely but the danger exists.
B、Such a collision might occur once every 25 years.
C、Collisions of smaller asteroids with Earth occur more often than expected.
D、It’s still too early to say whether such a collision might occur.
答案
A
解析
依据文章第五段第3行可以断定小行星与地球的碰撞概率极小,但可能性确实存在,这正是A项的内容。
转载请注明原文地址:https://tihaiku.com/zcyy/4057816.html
相关试题推荐
UnlessIwas________mistaken,therewas.somethingwrongwithLouise.A、verymuch
Inordertopreventstressfrombeingsetupinthemetal,expansionjointsare
Shewasafraidthatunlessthetrainspeededupshewouldloseher________toSco
Please____fromsmokinguntiltheaeroplaneisairborne.A、refrainB、preventC、res
Unlesswespendmoneytospotandpreventasteroids(小行星)now,onemightcrash
______howtheimmaturebrainpreventsseizure-inducedcellinjuryordeathcoul
Mostinjurescanbeprevented,providedaparentgoesaboutittherightway
Mostinjurescanbeprevented,providedaparentgoesaboutittherightway
WhenItrytounderstand_____thatpreventssomanyAmericansfrombeingashappy
Theideaofpublicworksprojectsasadevicetopreventorcontroldepressi
随机试题
One’suniversitydaysoftenappearhappierin________thantheyactuallywerea
从Smith处获知你朋友Tim昨天晚上遭到一个夜间行窃者的抢劫。但幸运的是Tim身边带钱不多,这名行窃者只抢走了Tim的一个手机,人并没受到伤害。你听到后马上写
第三方物流企业最基本的特征是( )。A.系统协调效益 B.提高客户企业的效益
履带式起重机操作灵活,使用方便,车身能360回转,并且可以载荷行驶,越野性能好,
“我一向不服输,过去工作再苦再累我都能忍受,可近来不知何故我开始变得脆弱、多虑,
上市公司公开发行股票,以下情形构成发行障碍的有()。A、上次非公开发行,当年营业
可与三氯化铁发生呈色反应的药物是A.苯佐卡因 B.盐酸普鲁卡因胺 C.二羟丙
7899
词之起源的传统说法是()。A.词起源于诗B.词起源于“曲子词” C.词起源
有机磷中毒鉴别诊断
最新回复
(
0
)