The less the surface of the ground yields(弯曲)to the weight of the body of a runner, _______ to the body．A.the stress it is greaterB.greater is the stressC.greater stress isD.the greater the stress
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D解析句意为：“跑步时地表对身体重量导致的压力的反应所产生的弯曲越小，力量对身体的作用就越大。”the less the surface与the greater the stress是完全对等的结构。