walking is good exercise.为什么不加a?

Walking is good ( )us walking is good () for me Walking is good exercise.同意句______is good exercise ______walk. Walking is good exercise,为什么walk要加ing? Walk is good for our health.还是Walking? I think walking is good for our health 翻译 walking is good exercise.为什么不加a? Walking is good exercise.为什么不用加冠词a啊? i think walking is good for my health walking为什么加ing walking is a good habit.To walk is a good habit.第二句话对吗? 【 】is good for your health A ,Walk B,walking C walk D【 】is good for your health A ,Walk B,walking C walk D towalk%D%A he thinks walking is good for us.(同义句)he ____ _____walking______good for us. he thinks walking is good for us.(同义句)he ____ _____walking______good for us. because walking is a good way to exercise.为什么要ing Walking in a_____way is good for our health.A.relaxed B.relaxing I think walking and running is good for our health 改错 ___ is good for your health.A.Walk B.Walking C.Run D.Runing ( )after supper is good for you A.Walk B.walks C.walked D.walking附加思路~