( ) is a good from of exercise for young a

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( ) is a good from of exercise for young a
( ) is a good from of exercise for young and old. A.The walk B.Walking C.To work D.Walk应该选哪个?为什么?

先看一下walk的词性吧.walk即可作名词,又可作动词.
Walk作名词讲时,即可是可数名词又是不可数名词.
不可数名词：此时walk可翻译为“步法,步行姿态”
如：I knew her by her walk.
我从走路的姿势看出是她.
可数名词：此时walk可翻译为“走,步行,散步”
如：She used to take a walk after supper.
她过去常在晚饭后散步.
而在题干中,walk显然是“步行,散步”的意思,即此时walk为可数名词.所以答案A和C都可以排除.
其实walk在作可数名词表示散步时,往往指的是一次次的具体的散步,并不能代表广义上的抽象的散步.
如：Let's take a walk together after supper.晚饭后我们一起去散步吧.（指马上吃饭后的这次行为,对于其他时间的行为并无指代性或是约束力.）
若要表示抽象的或是广泛意义上的散步,英语的习惯表达方式是用动名词“walking”.
如：Walking is good exercise.步行是很好的锻炼方式.
不定式和动名词作主语的区别在于：
不定式表示一次性的,具体的动作,特别是将来的动作；
动名词表示一般的,泛指的或是习惯行的动作.
综上所述,
本句话可翻译为：无论对于年轻人还是年长者,步行都是很好的锻炼方式.
知识点扩充：
和walk类似的词语有：dance,swimming等
如：Let's have a dance.我们一起跳支舞吧.（具体）
She loves dancing.她爱好舞蹈.（抽象）
He has a swim every day.他坚持每天游泳.（具体）
He is interested in swiming.他对游泳十分感兴趣.（抽象）
当然类似的词语还有很多很多,需要大家在平时的学习过程当中多多积累~

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