题目内容：

Is doing morning ()a good habit?Yes,it is.A.exercise B.exercises C.exercising D.exercised
(我知道C和D不对）

优质解答

A,锻炼,不可数名词,习题,可数名词,此处为锻炼·

追答：

（智力的）运用；（尤指）锻炼运动时不可数，比如说：The doctor advised him to take more exercise. (发音，体操，保健，深呼吸，钢琴等)练习，训练时可数，比如说： The teacher set her class a mathematics exercise for homework. 还有（部队等的）操练，演习也是可数的，比如说：military exercises军事操练

追问：

哦这样( ⊙ o ⊙ )啊！