_Stressful environments lead to unhealthy behaviors such as poor eating habits,which_______increase the risk of heart disease.
A．in turnB．in return
C．by chanceD．by turns
A
考查介詞。介詞短語in turn的意思是“依次，反過來”，符合語境；in return的意思是“作為……的回報”，by chance“偶然”；by turns “輪流地，逐個地”。
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