Stressful environments lead to unhealthy behaviors such as poor eating habits,which_______increase the risk of heart disease.A.in turnB.in returnC.by chanceD.by turns
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A解析考查介词。介词短语in turn的意思是“依次，反过来”，符合语境；in return的意思是“作为……的回报”，by chance“偶然”；by turns “轮流地，逐个地”。