在发生人感染H7N9禽流感确诊病例的县(区)内，应当在病例确诊后开展为期()的强化监测
A、3天
B、7天
C、10天
D、14天
E、21天
TheoriginoftheAmericanpartysystemcanbetracedto________.
A、thestrugglebetweentheRoyalistsandrevolutionariesintheWarofIndependence
B、theconstitutionaldebatebetweentheFederalistsandtheanti--Federalists
C、thestrugglebetweenthosewhoupheldslaveryandthosewhoopposedslavery
D、noneoftheabove
ForelectoralpurposesBritainisdividedinto659constituencies,eachofwhichreturns________totheHouseofCommons.
A、onemember
B、twomembers
C、threemembers
D、fourmembers
Inthe1960spopmusicunderwentarevolutionwhen________becameworldfamousandturnedtheirhometownofLiverpoolintoaplaceofpilgrimage.
A、tehBeachBoys
B、theRollingStone
C、theAnimals
D、theBeatles
Wehavetowaitforthebus,______?
A、havewe
B、haven’twe
C、dowe
D、don’twe