单选题
Stressful environments lead to unhealthy behaviors such as poor eating habits, which ______ increase the risk of heart disease.
【正确答案】
B
【答案解析】句意：压迫的环境会导致如不良饮食习惯之类的不健康行为，而这些行为反过来又会增强患心脏病的几率。In return作为回报。In turn依次，逐个地。By chance偶然，意外地。By turns轮流，交替。