Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which ______ affects the circulatory s

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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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