首页
登录
职称英语
Scientists have established that influenza viruses taken from man can cause
Scientists have established that influenza viruses taken from man can cause
游客
2023-09-28
46
管理
问题
Scientists have established that influenza viruses taken from man can cause the disease in animals. In addition, man can catch the disease from animals. In fact, a great number of wild birds seem to carry the virus without showing an evidence of illness. Some scientists concluded that a large family of influenza viruses may have evolved in the bird kingdom, a group that has been on the earth 100 million years and is able to carry the virus without contracting the disease. There is even convincing evidence to show that virus strains are transmitted from place to place and from continent to continent by migrating birds.
It’s known that two influenza viruses can recombine when both are present in an animal at the same time, the result of such recombination is a great variety of strains containing different H and N spikes. This raises the possibility that a human influenza virus can recombine with an influenza virus from a low animal to produce an entirely new spike. Research is underway to determine if that is the way that major new strains come into being, another possibility is that two animal influenza strains may recombine in a pig, for example, to produce a new strain which is transmitted to man.
选项
A、cause ill health in wild birds
B、do not always cause symptoms in birds
C、are rarely present in wild birds
D、change when transferred from animals to man
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3053637.html
相关试题推荐
Manyfamousscientists______atthemeetingheldinBeijingyesterday.A、turnedup
Manyfamousscientists_______atthemeetingheldinBeijingyesterday.A、turnedu
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Manyfamousscientists________atthemeetingheldinBeijingyesterday.A、turned
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Thescientistswantedtokeeppeople______aboutthebreakthroughintheirexpe
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
随机试题
Theneedforasatisfactoryeducationismoreimportantthaneverbefore.Nowa
Thereisnodoubt______thecompanyhasmadetherightdecisiononthesalespr
下列投资中,应作为长期股权投资核算的有()。A.对子公司的投资 B.对联营企业
制造型企业编制预算时,最重要的是()。A.公司级预算 B.项目预算 C.产供
根据法律法规的规定,统计行政许可项目有()。A.政府统计调查项目审批 B.涉外
尿液+联试带的检测项目不包括A.pHB.PROC.维生素CD.KETE.NIT
常用来增加油性基质吸水性的物质是A.凡士林B.石蜡C.二甲硅油D.羊毛脂E.十八
我国在西南地区进行的页岩气勘探获得重大成果,估算天然气资源量达千亿立方米,这是我
治疗真菌所致深部感染选用A.多西环素 B.红霉素 C.磺胺嘧啶 D.庆大霉
2019年12月1日,某企业无形资产账面价值800万元,采用直线法
最新回复
(
0
)