Tests have proved that caffeine affects the body by increasing the heart rate an

游客2025-03-19 40

问题 Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which______affects the circulatory system.

选项 A、in the long run
B、in turn
C、in return
D、as a result

答案 B

解析 in turn“反过来”；in the long run“从长远观点看”；as a result“结果”；in return“作为回报”。本句讲的是咖啡因使心率加快，而心率加快又会影响循环系统，谈论“心率和循环系统的关系及相互作用”，不仅仅是结果，所以B是最佳选择。

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