Question

【题目】Laughter produces short-term changes in the function of the heart and blood circulation,_________heart rate and oxygen consumption.

A. increasing B. to increase C. having increased D. being increased

Answer 1

【答案】A

【解析】考查非谓语动词。句意：笑可以使心脏运转和血液循环产生短期改变，增加心率和耗氧量。根据与逻辑主语Laughter是主动关系，故用现在分词作状语，起补充说明的作用。故选A。