问题：
[问答题]Passage 1 Health officials in western Siberia are to begin in slaughter of thousands of birds today after identifying Russia's first outbreak of a bird flu strain that can be fatal in humans. Doctors in neighboring Kazakhstan have also 1 that a 19-year-old poultry worker 2 admitted to hospital with 3 of bird flu, only to be diagnosed 4 double pneumonia. The H5N1 strain of avian 5 has killed 60 people 6 2003 in Vietnam, Thailand, Cambodia and Indonesia, but has rarely been found in birds or humans 7 Asia. Health officials 8 that H5N1 is infecting migrating birds, which could spread the 9 into Europe. Earlier this year China registered the first outbreak of HSN1 10 wild birds, some of which 11 to breeding grounds in Siberia. These birds could come 12 contact with others flying to Europe and North America. Russia's 13 began in the Novosibirsk 14 , about 1,750 miles 15 of Moscow in the Asian part of Russia, early last month, but the veterinary service 16 the virus only last week. Valery Mikheyev, the chief sanitary doctor of Novosibirsk, said that teams had been 17 the 18 birds and supervising the slaughter in 13 19 villages. He said, “The state of 20 of the inhabitants of these areas gives no cause for alarm. Up to 6,000 people are being checked per day.1. A. doubted B. confirmed C. suspected D. predicted2. A. was B. became C. got D. turned3. A. things B. marks C. symptoms D. brands4. A. for B. toward C. from D. as5. A. vaccine B. flu C. virus D. bacteria6. A. in B. since C. till D. for7. A. inside B. to C. outside D. into8. A. agree B. hold C. wonder D. fear9. A. disease B. sickness C. virus D. bacterium10. A. among B. between C. in D. with11. A. went B. migrated C. came D. fled12. A. at B. through C. into D. despite13. A. occurrence B. emergence C. advent D. outbreak14. A. region B. city C. town D. place15. A. west B. north C. south D. east16. A. identified B. detected C. discovered D. created17. A. sending B. collecting C. giving D. killing18. A. living B. surviving C. dead D. lingering19. A. affected B. far C. remote D. unrelated20. A. illness B. health C. emergence D. expedience
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