题目

填空①扩散现象：在相互接触时，的现象叫扩散。体、体、体均能发生扩散现象。②分子热运动的快慢与有关，越高，分子运动越，分子的扩散越。③扩散现象表明：一切物质的分子在，并且间接证明了分子间存在。 答案：【1】不同物质彼此进入对方【2】固【3】液【4】气【5】温度【6】温度【7】快【8】快【9】不停地做无规则运动【10】引力和斥力用所给单词的适当形式填空【1】There is a ________ (wood) table in the middle of the room.【2】Our head teacher told us we had to make a plan before ________ (take) action.【3】What was the air pollution ________ (cause) by?【4】There used to be many ________ (fisherman) in the village.【5】Can you tell me the machine's ________ (advantage)?