what __the population of America?a.is b.are 请详解

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what__thepopulationofAmerica?a.isb.are请详解what__thepopulationofAmerica?a.isb.are请详解what__thepopulatio

what __the population of America?a.is b.are 请详解
what __the population of America?
a.is b.are
请详解

what __the population of America?a.is b.are 请详解
A.
population在其中指人口,是单数名词.