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
UV Light Causes Skin Cancer Don’t laugh if you hear about kids hiding in their basement this summer. They might have been fr
UV Light Causes Skin Cancer Don’t laugh if you hear about kids hiding in their basement this summer. They might have been fr
admin
2012-07-29
28
问题
UV Light Causes Skin Cancer
Don’t laugh if you hear about kids hiding in their basement this summer. They might have been frightened by a recent report from Europe that liquid sunscreens don’t protect people from the sun’s harmful rays.
Researchers kept track of 631 children, some of whom used sunscreen and 46 . The researchers found that the kids who used sunscreen got more sun-caused moles than did the kids who didn’t use sunscreen. Kids with sun-caused moles are more likely to develop skin cancer later in life.
Did sunscreen harm the children? Probably not, the researchers concluded. They believe that the children relied too much on their sunscreen and stayed in the sun too long. Sunscreen is still safe to use, say skin experts, as long as it is used sensibly.
Solar Cares
Using sunscreen sensibly is more important than ever. Why? Skin experts like Martin Weinstock believe that 47 . Earth’s ozone layer appears to be getting thinner. Ozone is a gas. In the upper atmosphere, ozone blocks much of the sun’s harmful ultraviolet (UV) radiation. Polluting chemicals are thought to be destroying the ozone in some places.
Even though the world’s wealthy countries agreed to stop making polluting chemicals a few years ago, ozone is still disappearing. And that’s bad news, skin experts say, because UV light causes skin cancer, and skin cancer is the most common kind of cancer in the United States. More than a million new cases of skin cancer are showing up in the United States every year.
Scientists are looking at kids to reverse that trend. Why? Because getting too much sun when you’re a kid seems to set the stage for getting skin cancer when 48 . According to Weinstock, three-quarters of all skin cancers might never develop if people under the age of 18 avoided overexposure to the sun.
Glaring Facts
What happens when skin meets sun? Light rays, which come in varying wavelengths, strike the skin. Visible light consists of wavelengths 49 . Ultraviolet light consists of waves too short to be seen. UV light comes in several varieties, among them UVB and UVA. UVB wavelengths are slightly shorter than UVA wavelengths.
Scientists once thought that UVB light was harmful and that UVA light produced a healthful tan. But opinions have changed. Scientists still agree that UVB light causes sunburns. But now they suspect that both kinds of UV light damage the DNA of cells.
Moreover, scientists believe that either UVA light or UVB light or both weaken the body’s disease-fighting immune system. The body becomes less capable of repairing damaged cells, and such cells may go on to divide uncontrollably. In other words, 50
Three Little Words
To help people avoid getting harmed by the sun, the American Cancer Society has summed up its advice in three words: Slip, Slop and Slap. The words are short for "Slip on a shirt! Slop on the sunscreen! Slap on a hat!"
A they may become cancerous
B people can see
C you’re older
D UVA is different from UVB
E sunlight is growing more hazardous
F some of whom didn’t
选项
答案
B
解析
第四句在解释ultraviolet light时说,ultraviolet light的光波太短了,短到看不见了。“空白”所在的第三句在解释visible light,说visible light是一种某某性质的光波,而选项B提供的内容people can see正好说明visible light的性质。
转载请注明原文地址:https://kaotiyun.com/show/Zmmd777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
Readthefollowingpassageandanswerquestions9-18.1.TheAmericanbabyboomafterthewarmadeunconvincingadvicetothepo
Youwillhearonepassageaboutscienceanddailylife.Beforeyoulisten,readthelistofstatements,fiveofwhicharesummar
CONVERSATION2(Questions5-8)DiscountsforGymCoursesWehavediscountsfor【L5】______students.For
Lookatthetenstatementsforthispart.Youwillhearapassageabout"CreditCardsHistory".Youwilllistentoittwice
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
CancerChatisdifferentfromotherforumsinthatCancerHelpUKisawebsitethat
DriedFoodsCenturiesago,mandiscoveredthatremovingmoisture(51)foodhelpedtopreserveit,andthattheeasiestwaytod
TherewerenohumanbeingsontheearthduringtheIceAge.Theglaciersinthepassagearecomparedtoamachine.
Firsteditionsofcertainpopularbookscannotbeobtainedforloveormoney.
随机试题
链斗挖泥船的斗链运转速度与所挖土质有关,极软土的斗链运转速度为()斗/min。
国家安全是安邦定国的重要基石,维护国家安全是全国各族人民根本利益所在。党的十八大以来,为了推进国家治理体系和治理能力现代化,实现国家长治久安,更好适应我国国家安全面临的新形势新任务,我们党明确提出了总体国家安全观。总体国家安全观的根本是()
ThefirstEuropeanstockexchangewasestablishedinAntwerp,Belgium(比利时),in1531.TherewerenostockexchangesinEnglandun
以下关于患者角色所具有的特征不包括
关于真核生物mRNA转录后加工的说法错误的是
A、地高辛B、洋地黄毒苷C、乙胺丁醇D、异烟肼E、呋塞米伴有肝病的结核患者治疗结核可以使用()
阅读下面这首宋词,完成后面的题目。八声甘州辛弃疾夜读《李广传》,不能寐。因念晁楚老、杨民瞻①约同居山间,戏用李广事,赋以寄之。故将军饮罢夜归来,长亭解雕鞍。恨灞陵醉尉,匆匆未识,桃李无言。射虎山横一骑,裂石响惊弦。落魄封侯事
以下几种现象中,能够典型表现“注意的集中性”的是()
normalizedrelations
A.interactionB.experiencedC.reflectD.responseE.undertakenF.affectG.althoughH.frustra
最新回复
(
0
)