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
2024-04-15
33
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【B1】______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】______. As soon as men leave the atmosphere they【B5】______this radiation and 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【B6】______in space. The unit of radiation is called "rem". Scientists have reason to think that a man can【B7】______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—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 amounts 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【B9】______. Drugs might help to decrease the damage done by radiation, but no really【B10】______ones have been found so far. [br] 【B5】
选项
答案
are exposed to
解析
空格所在句缺谓语,故此空需填动词。beexposed to“暴露于……”,由于本段均为一般现在时,而该句主语为they,故be动词用are。
转载请注明原文地址:https://tihaiku.com/zcyy/3556309.html
相关试题推荐
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:Janelooksdepressedrecently.Ithinkitisbecauseofherhe
[originaltext]M:WhydoyousaythatTVisbadforpeople?W:Becauseinsteado
[originaltext]M:WhydoyousaythatTVisbadforpeople?W:Becauseinsteado
[originaltext]M:WhydoyousaythatTVisbadforpeople?W:Becauseinsteado
Rainforestsarecriticallyimportanttoourwell-being.Becausethey【B1】____
随机试题
AttendtheNextForumForthelastsixteenyearsCPS
下列关于绘制K线图规则的说法中,正确的有()。A、K线最上方的一条细线称为上影线B、K线下面的一条细线为下影线C、当日收盘价低于开盘价,K线中部的
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Noton
Iregret____________(年轻时没有努力一点工作).Iregretnothavingworkedharderwhileyoung.
真菌的特点包括()A.对苯酚、碘酊、升汞及甲醇较敏感 B.以寄生或腐生
人力资源管理的目的就是( )。A:学用一致 B:人尽其才 C:各得其所
下列各项属于元朝君主加强中央集权的措施的是()。A.建立郡县制 B.实行行省制
()关注提高工作的挑战性、意义性和完整性等方面,有利于在工作特征上得到改进。A
葡萄球菌和链球菌均不产生() A.血浆凝固酶 B.透明质酸酶 C.溶血素
双代号网络计划如下图所示(时间单位:天),其计算工期是()天。 A.20
最新回复
(
0
)