39. According to the passage, which of the following is true?
A. The best way to exercise is using the muscles as often as you can.
B. Daily exercise is the best way to keep fit.
C. Sweating helps you reduce your weight.
D. After doing 48—72 hours’ exercises, you must use the muscles again to keep fit
出自:新疆师范大学2021级学生第一学期结业课程考试《大学英语》