第22题: [填空题]_________________ (如果没有脚和地面这间的摩擦), people would in no way be able to walk. 参考答案:If there was no friction between their,feet and the ground/Without the friction between their feet and the ground 答案解析:[解析] 本题考查虚拟条件的表达或对without用法的掌握。由主句中谓语would do的形式及句子的含义可知,括号中的句子表达的是一种虚拟的条件,而表示对现在事实的虚拟,谓语动词应采用一般过去时。