首页
登录
职称英语
Space is a dangerous place, not only because of meteors but also because of
Space is a dangerous place, not only because of meteors but also because of
游客
2024-10-25
2
管理
问题
Space is a dangerous place, not only because of meteors 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 space suits 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 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. [br] 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 explores
答案
B
解析
细节推理题。根据文章第一段和第二段可知,宇航服和宇航船不能为宇航员阻挡住所有的辐射,并且可能导致他们第一代甚至第二代畸形。因此,B选项为正确答案。A项的内容并未在文中提到。根据文章第二段第四句可知,C项“宇航员的子孙都会畸形”是错误的。D项也与原文不符。
转载请注明原文地址:https://tihaiku.com/zcyy/3816017.html
相关试题推荐
ItcanbeinferredthatScottwasaherobecause______.[br][originaltext]
OfficialssaywaterlevelsalongtheBrahmaputraRiverstillareatdangerousle
OfficialssaywaterlevelsalongtheBrahmaputraRiverstillareatdangerousle
OfficialssaywaterlevelsalongtheBrahmaputraRiverstillareatdangerousle
Chinaiscalledthekingdomofbicyclesbecauseithasthelargestnumberof
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Becauseoftheeconomicslump,thereareonly______onthebeachasbefore.A、on
Sheoughttomakeashiftnow;sheisinabadmoodbecauseshe______inthedu
He______tenlecturesonAfricanliterature,butheonlygavethreebecauseof
随机试题
[originaltext]Paces,likefingerprints,areunique.Didyoueverwonderhow
Thepovertylineistheminimumincomethatpeopleneedforanacceptablest
SINFULNESS:PECCADILLO::A、depravity:distortionB、solicitude:apprehensionC、p
[originaltext]W:Doyouthinkdreamspredictthefuture?Ihadadreamlastnig
初中生物《合理营养与食品安全》 一、考题回顾 二、考题解析
患儿,10岁,发热2天伴水样腹泻2次,2小时前突然感胸闷不适、腹痛、烦躁不安,晕
商业银行发行的()是指本金和利息的清偿顺序列于商业银行其他负债之后、先于商业银行
房地产经纪人张某、李某共同发起设立了一家合伙制房地产经纪机构(以下简称甲机构),
消弧线圈验收细则规定,消弧线圈关键点见证时,关于器身干燥说法正确的(____)。
信用贷款是指凭借款人的人格发放的贷款。()
最新回复
(
0
)