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
外语
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphe
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphe
admin
2012-07-17
28
问题
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0. 1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed (畸形的) children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.
It can be inferred from the passage that______.
选项
A、the Apollo mission was very successful
B、protection from space radiation is no easy job
C、astronauts will have deformed children or grandchildren
D、radiation is not a threat to well-protected space explorers
答案
B
解析
本题是一道暗示推断题。问从文章中我们可以推断出什么。通读全文,我们知道作者主要在讲述太阳和其他星体的辐射会给人体带来伤害,但是辐射对人体的伤害程度很难确定,需要很长的时间才能显现出来,从而可以推断出防止受到辐射的伤害不是一件轻而易举的事情。因此,本题的正确答案应是B。
转载请注明原文地址:https://jikaoti.com/ti/U5KYFFFM
0
在职攻硕英语联考
相关试题推荐
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Thegreatchariotofsociety,whichforsolonghadrundownthegentleslopeoftradition,nowfounditselfpoweredbyaninter
Thegreatchariotofsociety,whichforsolonghadrundownthegentleslopeoftradition,nowfounditselfpoweredbyaninter
Apersonwhois______typicallyhasanxiousthoughtsanddifficultyinconcentrationorremembering.
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Inspiteoftheattractions,Guidehasnotadoptedthisuniformapproach,mainlybecauseunifyingratherdifferenttypesofobje
Becausetheworkerswerenewandinexperienced,themanagerhadtowatchthemand______theirworkclosely.
In1910over600,000Blackworkers,ortenpercentoftheBlackworkforcereportedthemselvestobeengagedin"manufacturinga
Aswehaveseen,thefocusonmedicalcareinoursocietyhasbeenshiftingfromcuringdiseasetopreventingdisease—especial
随机试题
环甲肌瘫痪引起声调降低的原因引起声带内收的原因
A.维生素B1B.维生素B5C.维生素ED.烟酸E.维生素C可用于慢性铁中毒的治疗()。
A.泼尼松龙B.奥利司他C.氟伐他汀D.多潘立酮E.吲哚美辛适合睡前服用的是()。
仲裁一旦生效,当事人即丧失的权利有()。
情景描述:某酒店施工现场(如图1所示)内,酒店主体设计层数为地上19层、地下2层,建筑高度83.9m,建筑占地面积4000m2,地上部分建筑面积51259.5m2,地下部分建筑面积5300.24m2。在建酒店东侧9m处为配电房,北侧10m处为可燃材料堆场及
某种产品的销售与季节因素有关,现根据各年的月销售量数据测定季节变动,若某月销售量明显受季节变动影响,该月份的季节比率()。
以下各项中,属于建筑安装工程直接工程费的是()。
在西安,两岁半女童在校车内窒息死亡,则其所在幼儿园()。
对互联网企业来讲,从用户那里收集到的信息主要包括消费习惯、行为特征、个人数据等。企业可以通过收集这些信息去开展大数据分析,进一步挖掘用户的潜在消费能力和更_______的价值,从而为用户提供更具_______的服务。依次填入划横线部分最恰当的一项是:
相对于小汽车和公共汽车这两种交通方式.轨道交通具有较强的规模经济性,即只有当乘客流量相当大时才会实现盈亏平衡,所以适宜在已经成熟的社区建设,但这样一来,就不能起到为土地开发导向的作用。如果想用轨道交通导向,就要忍受较长时间的亏损,并且冒较大投资风险,且难以
最新回复
(
0
)