单选题
The passage is mainly written to ______
A、
marriage can help our health.
B、
all kinds of social networks have effects on our life.
C、
social contact can be benefit of our longevity.
D、
share our social networks with each other.
【正确答案】
C
【答案解析】
由全文可知，文章的重点是讲述交际活动(主要是夫妻间)对于寿命的积极作用。故答案为C。
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