首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、A few cells of an animal or human being are damaged by radiation. B、A few cells of an animal or human being are damaged by rad
A、A few cells of an animal or human being are damaged by radiation. B、A few cells of an animal or human being are damaged by rad
admin
2014-11-27
36
问题
Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can’ t be seen or heard, or touched, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we cannot detect them, sense them, without a radio receiver. Similarly, we can’ t sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is harmful to human beings and other living things.
At very high levels, radiation can kill an animal or human being outright by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit, and if they are killed outright, your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years.
This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated and feel fine, then die of cancer five or twenty years later as a result. Or a child can be born weak or liable to serious illness as a result of radiation absorbed by its grandparents.
Radiation can hurt us. We must know the truth.
Questions 22 to 25 are based on the passage you have just heard.
22. Why is nuclear radiation mysterious?
23. How can high levels of radiation kill an animal or human being?
24. Which of the following cases is the most dangerous?
25. What will happen if a person is irradiated?
选项
A、A few cells of an animal or human being are damaged by radiation.
B、A few cells of an animal or human being are damaged by radiation and then reproduce themselves.
C、A few cells of an animal or human being are killed by radiation.
D、A few cells of an animal or human being are killed by radiation and will never reproduce themselves.
答案
B
解析
细节辨认题。短文中第二段指出如果辐射并没有直接杀死动物或人类体内的一些细胞,只是造成了一些损坏,然后这些细胞会自动再生,若他们产生变异,那么这种情况就是最危险的。由此可知B正确。
转载请注明原文地址:https://kaotiyun.com/show/04v7777K
0
大学英语四级
相关试题推荐
Tourismreallyisabigbusinessthesedays.It’s【B1】______.Itinvolveshotels,transportation,【B2】______,shops,andthousands
A、TheunrestinNorthAfricaandtheMiddleEast.B、Theglobaleconomicrecession.C、Theenvironmentalpollution.D、Theincrease
FreeSchoolMealsMillionsofAmericanschoolchildrenarereceivingfreeorlow-costmealsforthefirsttimeastheirparen
MexicoPutsItsChildrenonaDietFranBuckley,62,aJupiter,Fla.,realestateagent,realizedlastfallthatshewasn’t
Oneofthemostfamousandmosttalked-aboutactressestocomeoutofHollywoodhasdied.Film【B1】______ElizabethTaylordiedW
PreparingforMoreExpensiveDegreesinEnglandBalancingatightbudgetisoneofthemostdifficultaspectsofbeingastu
A、Loweringtransportationfees.B、Theenvironmentalengineeringclass.C、Theman’scarintheshop.D、Betterenvironment.D对话中女士
A、Bydoortodooradvertising.B、Byusingsymbols.C、Byverbalannouncements.D、Bywrittenmessages.C选项均为“By+现在分词”开头以及其中的advert
A、Shehasn’tgonecampingforseveralweeks.B、Shelikestotakelongcampingtrips.C、Sheprefersnottogocampingonweekends
A、Walkthedog.B、Getoutforsomeexercise.C、Gotothepethospital.D、Gototheanimalshelter.D行动计划题。女士说想养狗,男士提到在动物收养所能够买到更
随机试题
脊柱各段中椎间盘最薄的部位是
下列叙述中正确的为
直流低压电器是指直流电压在()及其以下的电器。
下列属于输入设备的有( )。
期货公司未按期补充更正风险监管报表的,公司住所地中国证监会派出机构可以认定公司的风险监管指标不符合规定标准。()
中国公民张先生是某民营非上市公司的大股东,同时也是一位作家。2019年5月取得的部分实物或现金收入情况如下:(1)公司为其购买了1辆轿车并将车辆所有权登记到其名下,该轿车购买价为35万元。(2)将本人一部长篇小说手稿的复印件拍卖取得收入
甲企业从某拍卖公司通过拍卖购进两辆轿车,其中一辆是未上牌照的新车,不合税成交价60000元,国家税务总局核定同类型车辆的最低计税价格为120000元;另一辆是已使用6年的轿车,不含税成交价50000元。甲企业应纳车辆购置税()元。
借款人的权利包括()。
Schoolsthroughouttheworldareexperiencingaperiodofrapidchangeand,inmanycases,arefindingthatextremely【M1】______
Wemightbelivingforlongerthanever,butwearesick.About95percentofpeoplehaveatleastonehealthcomplaint,witha
最新回复
(
0
)