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    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

    A　　


    解析:

    in turn (插入语)转而，依次，而又：We need revision of estimated sales and this, in turn , will mean revision in production schedule. (我们必须修改预计销量，而这反过来又意为这修订生产计划。)in return 作为报答: I wish I could do something for you in return. (我要是能为你做点事作为报案就好了。)I gave him a present but he gave me nothing in return.（我送给他一份礼物，可他却什么也不给我作为答谢。）by chance (=by accident)偶然地；无意中：I meet him by chance on Fifth Avenue.(我偶然在第5大街上遇到他。)by turns 轮流地，依次：There were twelve of us in the boat and we rowed by turns.(船上有12人，我们轮流划船。)

    　　本题译文：紧张的环境会导致诸如不良的饮食习惯等不健康行为，而后者又会增加患心脏病的危险。

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