Last year,France recorded just 31 cases of the mad cow disease.The rising numbers are in part __1_ a new testing program that focuses on cows that are most __2_.That program has __3_ 39 cases.But still 60 new cases were identified in the usual way,_4__ were found in 1999.Many scientists __5_ that this year,five years after safety precautions were__6_,the number od cases would be __7_.
1 ]% W0 u' _- n# R3 I The rise in cases has __8_ some scientists to question whether the disease can be transmitted in ways not yet understood.Scientists are still __9_ by the disease,first recognized in cows in 1986.
( b: `; I, [8 s X/ g# k It appears that it is not casused by a bacteria,virus or fungus,but __10_ infectious particles called prison,perhaps __11_ a virus or other agent.The desease kills cells in the brain,__12_ it spongy and full of holes.
2 E6 Z m9 Y( g: o% k5 Z France has taken more steps to __13_ safety than most European countries,__14_ refusing to take English beef __15_ the European Union.But some scientists believe that France has not been __16_ in imposing the ban on feed that __17_ animal parts.
! e- l4 l) ]& Z/ }" G. L Some French officials hope that the sudden interest in mad cow disease will mean that French consumers will become educated about it,thereby recognizing that French beef is actually __18_ controlled.Every cow is given a passport at birth ,and extensive information about is parentage and __19_ it was raised must be __20_ to any slaughterhouse.When a diseased animal is found,the nentire herd is destroyed.
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发表于 2012-8-14 13:22:22
