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1、炎德英才雅礼中学2024高三月考四英语
2、炎德英才大联考雅礼中学2024高三月考试卷四

A.To change the spring's active length. B.To make the spring easier to compress. C.To adapt to the leg's changing stiffness. D.To make an exoskeleton firmly tied to the foot. 14.How does the author describe the effectiveness of the device in the text? A.By analysing data. B.By defining. C.By listing some facts. D.By quoting opinions.