2022考研英语阅读100篇及剖析(十七)
玩笑的英文TEXT ONEjapan gay
画廊英文imBritons most aring memories of their encounter with foot-and-mouth dia in 2001 are of the piles of animals slaughtered to try to stop its spread. Such a draconian policy might have been accepted had the dia been controlled quickly. But its ineffectiveness more than 6m cows, sheep and pigs were culled before the dia was eradicated led to widespread revulsion and a government rethink.
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Just as in 2001, if an animal is thought to be infected, its herd will be culled and a quarantine zone t up. But this time, unless the dia is stamped out quickly, animals nearby will also be vaccinated to create a fire-break across which it is unlikely to travel. Already 300,000 dos of vaccine have been ordered, so that if government vets decide that slaughter alone is unlikely to be effective, they can start vaccinating straight away.
greyHumans almost never catch foot-and-mouth and it rarely kills the cloven-hooved beasts it affects. But animals produce less milk and meat, so its economic effects are vere. It is also highly contagious: infected livestock produce the virus that caus it in large quantities, and transmit it through saliva, mucus, milk, faeces and even droplets in their breath.
Even so, only countries where foot-and-mouth is endemic, as in parts of Latin America, vaccinate all animals. One reason is cost: the dia is caud by a virus with ven main types and tens of sub-types, with a targeted vaccine needed for each strain and shots repeated, perhaps as often as twice a year. It is also becau vaccinating damages exports. Places that are free from foot-and-mouth are unwilling to import vaccinated beasts, or fresh meat from them, becau they may still carry the dia.cad是什么意思
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异鬼夜王的真实面目The fear of being shut out of foreign markets led to the British governments disastrous foot-dragging over vaccination in 2001. But that same year an outbreak in the Netherlands involving 26 farms was brought under control in just one month by vaccinating 200,000 animals. Though healthy, the beasts then had to be culled so that farmers could return to exporting without restrictions as soon as possible.
Not even eternal vigilance on imports can keep a country free of foot-and-mouth dia: the latest outbreak was apparently caud by a breach of bio-curity at the Pirbright laboratory complex in Surrey, where government rearchers keep the live virus for vaccine rearch and Merial, an American
animal-health company, manufactures vaccine for export. Human action, accidental or deliberate, ems likely to have been involved.
大象的英文Ironically, one reason for eschewing vaccination is that although it provides the best hope of dealing with outbreaks, maintaining the capacity to produce vaccine is itlf a risky business. Many earlier episodes of foot-and-mouth in countries normally free from the dia have been caud by laboratory escapes; in 1970 a leak from Pirbrights isolation facilities was fortunately contained.
