A、They will have higher blood pressure. B、They will gradually lose their appetite. C、Their immune functioning could be improved.

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问题

选项 A、They will have higher blood pressure.
B、They will gradually lose their appetite.
C、Their immune functioning could be improved.
D、Their blood circulation could be improved.

答案C

解析 短文最后指出,其他的研究表明欢快的笑声与提高免疫能力和减轻压力有关。由此可知。如果人们常常能够开怀大笑,那么他们的免疫能力可能会提高。
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