如何区分exercise,exercises,practice,activities,activity?

如何区分exercise,exercises,practice,activities,activity? exercis very how often do you exercise every day?改为同义句__ __ __ a week do you exercis? Exercise(exercis) is (are ) good for our health.Exercise 作为锻炼讲,是不可数名词,后加is 还是are.有exercis这个单词么?如果有,放在这个句子中,需用is还是are. 问题三：如果有exercis 这个单词,那么它和exercise 最上面一段 This will make the most out of your exercis最上面一段 This will make the most out of your exercise 是什么意思 exercise怎么区分它是动词还是名词! exercise one's right中的exercise如何翻译?为什么? exercise exercise Exercise 如何区分转基因大米 如何区分东经西经 如何区分转基因大豆 如何区分欧洲各国人 如何区分地沟油 如何区分转基因食品 如何区分转基因大豆 如何区分颜色