If you want to be healthier, you shouldn't do in the classroom all the time but do more on the playground.
A. exercise; exercises
B. exercise; exercise
C. exercises; exercises
D. exercises; exercise
网友回答
A. exercise; exercises
B. exercise; exercise
C. exercises; exercises
(答案→)D. exercises; exercise
解析：如果你想要更健康，你不应该一直在教室里做体操，而是在操场上做更多的锻炼。Exercise做锻炼和练习的意思讲时，是不可数名词；当做某种体操眼保健操等时是可数名词。结合语境可知选D。