![HealthofficialsinCanadaareverybusythesedays.Theyareplac...]( "HealthofficialsinCanadaareverybusythesedays.Theyareplac...")
- 问题详情：HealthofficialsinCanadaareverybusythesedays.TheyareplacingchickensatfixedpointsallalongtheirborderwiththeUnitedStatesofAmerica.TheyareusingthesechickenstoseeifthedeadlyWestNilevirusexistsintheircountry.Thevirusspreadstobirds,sotheythinkthatth...
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