首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because
Space is a dangerous place, not only because of meteors(流星)but also because
游客
2023-08-29
49
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【B1】______ again acts as our protective blanket on earth. Light gets through, and this is【B2】______ for plants to make the food which we eat. Heat, too, makes our environment【B3】______. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【B4】______ off. As soon as men leave the atmosphere they are exposed to this【B5】______ and their spacesuits or the walls of their spacecraft, if they are inside, do【B6】______ a lot of radiation damage.
Radiation is the greatest known danger to【B7】______ 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 【B8】______ difficult to be sure about radiation damage—【B9】______, 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 amounts of rems.【B10】______,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,【B11】______ [br] 【B6】
选项
答案
prevent
解析
太空服和宇宙飞船都有防辐射的基本功能,据此常识,不难听出这里的“prevent”,注意空格前有个起强调作用的“do”,因此用动词原形。
转载请注明原文地址:http://tihaiku.com/zcyy/2968466.html
相关试题推荐
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
Childrenare【C1】______seriousillnessesbecauseoftheirparentssmokingat
随机试题
1OscarWildesaidthatworkistherefugeofpeoplewhohavenothingbetter
8086系统中可屏蔽中断的引入端为()。A.NIMI B.INTR C.M/
采光系数标准值是根据我国下列哪类光气候区的室外临界照度制定的?()A.Ⅰ类
在机器指令的地址字段中,直接指出操作数本身的寻址方式称为______。A.隐含寻
我国医学伦理学的基本原则是()A.救死扶伤,实行医学人道主义 B.全心全意为
A.宣痹汤加减 B.蠲痹汤合独活寄生汤加减 C.大秦艽汤加减 D.真武汤合
有“疮家圣药”之称的药物是A、野菊花 B、金银花 C、生姜 D、连翘 E
如图所示正方形截面的形心为C点,其对y,y1轴的惯性矩为Iy、Iy1,这两惯性距
在变电所设计中,下列哪些电气设施的金属部分应接地?()A.变压器底座和外壳
A.异柠檬酸脱氢酶、α酮戊二酸脱氢酶 B.柠檬酸合成酶、琥珀酸脱氢酶 C.柠
最新回复
(
0
)