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
I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the
I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the
admin
2013-01-25
71
问题
I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the empty space in front of her as though using Mace against an imaginary assailant. She appeared very determined. Where others are satisfied with antibacterial-laced sponges, dish soaps, hand sanitizers and telephone wipes, here was a woman who sought to sterilize the air itself.
As a casual student of microbiology, I find it hard to escape the absurdity here. This woman is, like any human being, home to hundreds of trillions of bacteria. Bacteria make up a solid third, by weight, of the contents of her intestines. If you were to sneak into her bathroom while she was showering-and based on my general impression of this woman from the advertisement, I don’t recommend this-and secret away a teaspoon of the water at her feet, you would find some 820 billion bacteria. Bacteria are unavoidably, inevitably-and, usually, utterly benignly-a part of our world.
The fantasy of a germ-free home is not only absurd, but it is also largely pointless. Unless you share your home with someone very old, very young (under 6 months) or very ill, the few hundred bacteria on a countertop, doorknob or spoon pose no threat. The bacteria that cause food poisoning, the only significant rational bacterial worry in the average home, need to multiply into the thousands or millions before they can overwhelm your immune system and cause symptoms.
The only way common food poisoning bacteria can manage this is to spend four or five hours reproducing at room temperature in something moist that you then eat. If you are worried about
food poisoning, the best defense is the refrigerator. If you don’t make a habit of eating perishable food that has been left out too long, don’t worry about bacteria.
Viruses are slightly different. You need only pick up a few virus particles to infect yourself with a cold or flu, and virus particles can survive on surfaces for days. So disinfecting the surfaces in the home should, in theory, reduce the chances of picking up a bug.
In practice, the issue is less clear. A study by Dr. Elaine Larson at the Columbia School of Nursing called into question the usefulness of antibacterial products for the home. In New York, 224 households, each with at least one preschooler, were randomly assigned to two groups. One group used antibacterial cleaning, laundry and hand-washing products. The other used ordinary products.. For 48 weeks, the groups were monitored for seven symptoms of colds, flu and food poisoning-and found to be essentially the same. According to Dr. Gerba’s research, an active adult touches an average of 300 surfaces every 30 minutes. You cannot win at this. You will become obsessive-compulsive.. Just wash your hands with soap and water a few times a day, and leave it at that.
The word "bug" used in Paragraph 5 means ______.
选项
A、a bacterium
B、a cold
C、a flu
D、a virus
答案
D
解析
第5段中的“bug”指的是细菌,因此D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/rH1O777K
0
考博英语
相关试题推荐
ThismonthSingaporepassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparents.CalledtheMai
Itissaidthatsomethingwas____waybackwhenEnronCEOJeffreyWilliamdepartedthecompanyonlysixmonthsafterbeingelevat
Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn."Peopleareinvite
Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn."Peopleareinvite
Inadditiontoredistributingincomes,inflationmayaffectthetotalrealincomeandproductionofthecommunity.Anincreasein
Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.B
Theonceseparateissueofenvironmentanddevelopmentarenow______linked.
Themostpowerfulforceshapingsocietytodayisscienceappliedbyindustry,medicine,andthemilitary.【101】Newscientificide
Thenormalhumandailycycleofactivityisofsome7-8hours’sleepalternationwithsome16-17hours’wakefulnessandthatthe
IneverymajorcityinAmerica,commutersarespendingmoreandmoretimeintheircarsfightingtraffic.TheTexasTransportati
随机试题
下列不属于业主方进度控制内容的是()。
患者,男性,34岁。4天来频繁呕吐,不能进食,神志淡漠,肌肉无力,腹胀,膝腱反射减弱。为确诊应主要检查
A.胰岛素B.双胍类降糖药C.α-葡萄糖苷酶抑制剂D.磺酰脲类降糖药E.非磺酰脲类促胰岛素分泌剂需2~3周才达到降糖疗效的是()
【案情】赵文、赵武、赵军系亲兄弟,其父赵祖斌于2013年1月去世,除了留有一个元代青花瓷盘外,没有其他遗产。该青花瓷盘在赵军手中,赵文、赵武要求将该瓷盘变卖,变卖款由兄弟三人平均分配。赵军不同意。2013年3月,赵文、赵武到某省甲县法院(赵军居住
对内桥与外桥接线(双回变压器进线与双回线路出线),下列表述中()是错误的。
我国对证券投资基金的监管模式是()。
(2011年考试真题)运用公式“y=a+bx”编制弹性预算,字母x所代表的业务量可能有()。
下列有关成本中心业绩考核的表述中,不正确的有()。
编辑的写作能力包括()。
设A为可逆的实对称矩阵,则二次型XTAX与XTA-1X().
最新回复
(
0
)