首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星) but also becaus
Space is a dangerous place, not only because of meteors(流星) but also becaus
游客
2023-11-18
42
管理
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. [br] The best title for this passage would be ______.
选项
A、The Atmosphere and Our Environment
B、Research on Radiation
C、Effects of Space Radiation
D、Importance of Protection Against Radiation
答案
C
解析
大意判断题。文章第一段指出,太空是一个危险的地方主要是因为太空辐射。离开大气层的宇航员虽有宇航服及宇航船的保护,但也免不了接受辐射。文章第二段指出辐射危害在短期内难以觉察,药物可以减轻辐射危害,但真正有效的药物迄今还未被发现。由此可以看出文章谈及的主要是太空辐射的后果方面的事,所以选项C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3196623.html
相关试题推荐
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Themilitantwassentencedtodeathbecauseof[br][originaltext]Acourt
Sheoughttomakeashiftnow;sheisinabadmoodbecauseshe______inthedu
Becauseoftheeconomiccrisis,industrialoutputintheregionremained______.A
Scientistswhobelievecellphonesaredangeroushavebeenthrowingouthypo
Scientistswhobelievecellphonesaredangeroushavebeenthrowingouthypo
Scientistswhobelievecellphonesaredangeroushavebeenthrowingouthypo
Scientistswhobelievecellphonesaredangeroushavebeenthrowingouthypo
随机试题
[originaltext]M:DoreportersfornewspaperslookdownonreportersfromTVand
WithourSelfHelpSystem,youcanquicklyfindanswerstocommonquestionsandr
负有安全生产监督管理职责的部门的工作人员,有下列行为之一的,给予降级或者撤职的处
某项目建设方没有聘请监理,承建方项目组在编制采购计划时可包括的内容有()。
妊娠合并慢性肾炎患者,孕期主要并发症不包括A.妊娠期高血压疾病 B.胎盘早剥
对“S”曲线描述正确的是()。A.是工程进度的表达. B.是对质量的统计分析
悬臂梁AB由三根相同的矩形截面直杆胶合而成,材料的许可应力为[σ]。承载时若胶合
一切公安工作任务最后都要落实到基层,因此,抓公安队伍建设重点应放在基层,内务建设
适宜采用越级行文方式的情况有( )。A.情况特殊紧急,如逐级上报下达会延误时机
依据《企业安全生产标准化基本规范》,安全风险辨识范围应覆盖本单位的所有活动及区域
最新回复
(
0
)