swimming and running () good for our health 用is还是are为什么??

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swimming and running () good for our health 用is还是are为什么??
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swimming and running () good for our health 用is还是are为什么??
swimming and running () good for our health 用is还是are
为什么??

swimming and running () good for our health 用is还是are为什么??
联合主语(两个或两个以上的成份以 and联接)是复数,需要动词复数

are

are

IS

are
swimming and running 是联合主语(两个)