【简答题】The road was covered with fallen flowers of the _________. (trees, trees')
【单选题】Though the road covered with snow was very smooth, the old man smilingly ____ to be helped by others across the road.
【单选题】The road was covered ___________fallen leaves.
【单选题】反射可分为简单反射(即非条件反射)和复杂反射(即条件反射),下列四种反射活动中,哪种属于简单反射(即非条件反射)( )
【简答题】路面结了一层冰。 The road was covered with ___________________.(sheet)