问题
选择题
_Stressful environments lead to unhealthy behaviors such as poor eating habits,which_______increase the risk of heart disease.
A．in turn
B．in return
C．by chance
D．by turns
答案
答案：A
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”。