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
33
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
It’sFridaynight,andyouwanttowatchamovieathomewiththatspecial
[originaltext]M:Thefaucetinthebathroomisleaking.W:WhynotgetEdwardt
Itmaybetoocoldtoventureoutside,butthatdoesn’tmeanyouneedtoput
关于期货交易和远期交易的作用,下列说法正确的有()。A、期货市场的主要功能是风险定价和配置资源B、远期交易在一定程度上也能起到调节供求关系,减少价格波
A.qa/4 B.qa/3 C.qa/2 D.qa
某项目的绩效报告给出了该项目的PV、EV、AC、CV、CPI、SPI,据此可
患者,男性,52岁。近日胁肋隐痛,悠悠不休,遇劳加重,口干咽痛,心中烦热,头晕目
潘某请好友刘某观赏自己收藏的一件古玩,不料刘某一时大意致其落地摔毁。后得知,潘某
下列哪项不是维生素K的适应证A.梗阻性黄疸所致的出血 B.早产儿及新生儿肝脏合
政府对建设工程质量监督的职能() A.包括监督工程参与主体各方的质量行为,
最新回复
(
0
)