首页
登录
学历类
Space is a dangerous place,not only beca
Space is a dangerous place,not only beca
题库
2022-08-02
52
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 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"rein".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__A.the Apollo mission was very successfulB.protection from space radiation is no easy jobC.astronauts will have deformed children or grandchildrenD.radiation is not a threat to well-protected space explorers
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
【考情点拨】推理判断题。【应试指导】由最后一句“Drugs might…but no?really effective ones have been found So far.”可知,目前人类还没有找到有效的方法去避免辐射的危害,所以免受辐射危害并非易事,故选B。
转载请注明原文地址:https://tihaiku.com/xueli/2672702.html
本试题收录于:
英语专升本题库专升本成考分类
英语专升本
专升本成考
相关试题推荐
Spaceisadangerousplace,notonlybec
Spaceisadangerousplace,notonlybec
Spaceisadangerousplace,notonlybec
Spaceisadangerousplace,notonlybec
Spaceisadangerousplace,notonlybeca
Spaceisadangerousplace,notonlybeca
Spaceisadangerousplace,notonlybeca
Spaceisadangerousplace,notonlybeca
随机试题
Thefrownontheman’sfaceshowedthathewasdispleased.A、lookoffearB、look
Thankstothemeansofmoderntransportationandcommunication,theworldisget
StudyActivitiesinUniversityInordertohelpcoll
设X,Y为两个随机变量,E(X)=E(Y)=1,D(X)=9,D(Y)=1,且则
正常骨髓象全片可见巨核细胞A.10~25个 B.25~35个 C.5~15个
2020年5月7日、国家工业信息安全研究中心AI研发总部基地项目揭牌,新加坡南
当项目建成后用于出租经营时,由于经营期限很长,计算开发成本利润率就显得意义不大,
下列应设消防给水系统的是()。A.加油站 B.液化石油气加气站 C.压缩天
2014年,全国资助学前教育(幼儿)、义务教育、中职学校、普通高中和普通高校学生
投资项目评价用的建设期是()所需的时间。 A.从项目有投资意向起到项目建成投
最新回复
(
0
)