A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.A.in its turnB.in returnC.in turnD.by turns
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C解析试题分析：考查介词词组： in return做为回报，in turn依次by turns轮流，句意：繁重的学习负担导致不健康的行为象，饮食习惯差，这反过来破坏学生的健康。选C。考点：考查介词短语辨析
点评：介词的考查重在积累。解题技巧: 1）明确词意 所选