首页
登录
职称英语
The timing of flu season is a little hard to predict. Part of what makes it
The timing of flu season is a little hard to predict. Part of what makes it
游客
2024-01-15
56
管理
问题
The timing of flu season is a little hard to predict. Part of what makes it unpredictable is that scientists still don’ t understand exactly why we have one at all. There have been lots of theories:
One theory is that people spend more time indoors, with the windows closed, breathing each other’ s air. Other scientists have argued that cold of winter weakens our immune systems. A third theory is that the flu virus lives in the cold, dry air, but suffers in the warm, humid air.
For a while, scientists had a hard time testing these theories: they needed to run experiments, but researchers aren’ t allowed to infect humans with illnesses, and most lab animals aren’t affected by the flu the same way people are.
In 2007, a medical researcher named Peter Palese found an 80-year-old journal article that reported that guinea pigs (豚鼠)get infected and pass on the flu just like humans.
Palese decided to test Theory 3. The research team led by Palese ran several experiments and in each experiment, they injected half the guinea pigs with influenza A (the common flu), and put them in a box next to a box of uninfected animals.
At a temperature of 41 degrees, all four of the exposed guinea pigs caught the flu, but when Palese repeated the experiment at 68 degrees, only one of the animals was infected. And when he ran the test at 86 degrees, none of the exposed animals got sick.
The researchers also ran experiments where they varied the humidity in the room but kept the temperature constant: the drier the air, they found, the more animals got sick.
Palese’ s study showed that the influenza virus does spread more effectively in cold, dry air. [br] Palese got the idea to experiment with guinea pigs from______.
选项
A、a past research
B、an 80-year-old scientist
C、a fellow researcher
D、a journal article long time ago
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3365874.html
相关试题推荐
Thelittlegirlshowednoanxietybeforethecompetition.Sheseemed______forit
Wouldyoumind________quietforalittlewhile?Iamdoingmycoursework.A、keep
Iwentto________Londonyesterdayandsaw________strangeoldmanandalittlegi
Hislittlecarisn’t______forfivepeople.A、enoughbigB、bigenoughC、asenough
InBritain,thebestseasonoftheyearisprobably______spring.A、laterB、latter
Thelittlegirlwasturned______byherstepfatherandshehadnoplacetogo.A、o
Shehas______chancetowintheelectionasheropponentistoostrong.A、littleB
Whenshedoessomething,Mrs.Brownfeelsthatherlittlechildisalways______.
______studentwithalittlecommonsenseshouldbeabletoanswerthequestion.A
Aseasonticket______theholdertomakeasmanyjourneysashewishedwithinthe
随机试题
Twokeysaretobeputintothekeychainthatalreadyhas5keys.Whatisthep
Theyoungcouple______withtheWhitesduringtheirstayinNewYorkCity.A、put
WhichofthefollowingwillNOTpossiblyleadtoheartdisease?[br][originalt
图示长管并联管段1、2,两管段长度I相等,直径d1=2d2,沿程阻力系数相等,则
下述协议中与安全电子邮箱服务无关的是() A.SSL B.HTTPS C
(2018年真题)投资主办人与原证券公司解除劳动合同的,原证券公司应当在()日
女孩9个月,母乳喂养,刚开始添加辅食,食欲较差,偏食。体检发现其皮肤弹性尚可,腹
甲被依法宣告失踪,乙为甲的财产代管人。下列选项中,由乙从甲的财产中支付的有(
某技术方案年设计生产能力为15万台,年固定成本为1500万元,产品单台销售价格为
与平行承发包模式相比,施工总承包模式的特点有()。A.业主的合同管理工作量大大
最新回复
(
0
)