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
Many people today are worried about bird flu. They are afraid that it will pass from birds to humans and that thousands of peopl
Many people today are worried about bird flu. They are afraid that it will pass from birds to humans and that thousands of peopl
admin
2018-11-19
68
问题
Many people today are worried about bird flu. They are afraid that it will pass from birds to humans and that thousands of people will die in a pandemic. In 1918 a flu virus killed about 50 million people around the world. The virus was called Spanish influenza (or Spanish flu, for short)because Spanish newspapers first described the disease. Now, after nine years of work, scientists in an American laboratory in Atlanta, Georgia, have produced a copy of the Spanish flu virus. They are also going to publish the genetic sequence of the virus on the Internet and some experts are afraid that other laboratories could copy the virus.
Scientists have copied the virus because they want to understand why the 1918 Spanish flu pandemic killed so many people. In a report in the journal Science, Dr. Jeffery Taubenberger and a team of scientists in the USA show that the copied virus is extremely powerful. The scientists injected the virus into mice and the mice began to lose weight very quickly. They lost 13% of their weight in two days and all of the mice died within six days.
" I didn’ t expect it to be as lethal as it was, " Dr. Terrence Tumpey, one of the scientists in the team, told the journal Nature. In another experiment, they injected more mice with a normal type of flu. The mice lost weight at first but then they got better and did not die. The experiments showed that the mice with the Spanish flu virus had 39,000 times more flu virus in their bodies than the second group of mice.
The scientists who copied the virus say their work has already provided important information about the virus and helps to explain why it is so lethal. But other expels are worried that the virus could escape from the laboratory. " Some people will think that they have really created a biological weapon." said Professor Ronald Atlas of the University of Louisville in Kentucky. " I am even more worried now than I was before about the possibility of a flu pandemic. The 1918 flu pandemic started with bird flu and that might happen again today with Asian bird flu."
Some scientists are worried about the publication of the genetic sequence on the Internet. They are afraid that biologists could copy the virus using the information on the Internet. This could be very dangerous.
It took a long time to copy the virus. Scientists used material taken from the lungs of people who died from the flu virus in 1918. In a second report in Nature, Taubenberger and his colleagues analyzed the genetic make-up of the virus. They were surprised to find that it was completely different from all the normal human flu viruses. This probably means that Spanish flu jumped from birds to humans and did not mix with a human virus first. This is very worrying for scientists because in the past everyone believed that a pandemic was only possible if a bird flu virus mixed with a human flu virus.
Taubenberger says it is very important to know what changes in the virus caused the 1918 Spanish flu virus. This will help scientists to work out which viruses might cause a pandemic. The H5N1 bird flu in Asia is already changing and it could infect humans, he said.
Viruses have escaped from high-security labs before. The SARS virus escaped at least twice, once in Taiwan and once in Singapore, But some scientists believe a pandemic will not happen even if the virus escapes, because most people are naturally immune and there are now a lot of drugs which protect people from flu.
Questions 66—70
Answer the following questions according to the passage.
How many people died in the Spanish flu pandemic?
选项
答案
About 50 million.
解析
文章第一段明确指出1918年西班牙流感病毒致命5千万。
转载请注明原文地址:https://kaotiyun.com/show/TJNK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
Allowmetogiveyoualittleadviceaboutwriting【D1】______First,makeyourcharacters【D2】______Makesurethattheybehaveand
Aknowledgeofdifferencesbetweenculturesinanever-shrinkingglobalizedworldarebecomingoneoftheessentialskillsthat
Aknowledgeofdifferencesbetweenculturesinanever-shrinkingglobalizedworldarebecomingoneoftheessentialskillsthat
Whichofthefollowingdiagramsistheoddoneout?
Whetherwe’llholdthesportsmeetingdependsontheweather,______?
Ifyou【D1】______smoothskinthatglowswithyouth,thechancesarethatatsomepointyouwillhaveheardtheexhortationtodri
Graffiti—adangerouswayoflifeScrawlinggraffitiisseenasacrimeintheUK,yetintheUSithasbecomearecognizedartf
Jessewasastraight-Astudent—aresultofcountlesshoursspentstudyingduringcollege.Shegraduatedatthetopofherclass
Everyyearalargenumberofyoungpeopleleaveschoolandbeginwork.Some【21】jobsonfarmsorinindustry.Othersacceptposit
What’stheweatherlikewhereyouare?Chancesarethere’sacloudsomewhereonyourhorizon—acollectionofmillionsofmicrosc
随机试题
当浏览网页而不想播放其中的声音时,可以______。
Thatcarlooks_____.
不属于住院病案登记内容的必要项目是
女,28岁。停经45天,右下腹剧烈疼痛1小时伴晕厥,平素月经规律。首先考虑的诊断是
债券的净价报价是指()。
甲上市公司在上市后第6个月时召开股东大会,该次股东大会通过的下列决议中,符合公司法律制度规定的是()。
A企业年度财务报告批准报出日是次年4月30日。A企业2007年12月31日前因未履行合同被乙企业起诉,A企业已将75万元的预计负债登记为“预计负债”科目。2008年3月20日法院判决A企业需偿付乙企业经济损失78万元,A企业不再上诉并执行。A企业应进行的
股东年会一般在每年的年终结算后()内,由()组织召开。
国务院同意建立全国农民合作社发展部际联席会议制度的批复发文字号农业部:你部《关于建立全国农民合作社发展部际联席会议制度的请示》收悉。现批复如下:同意建立由农业部牵头的全国农民合作社发展部际联席会议制度。联席会议不刻制印章,不正式行文,请按照国务
Whataretheytalkingabout?
最新回复
(
0
)