Question

which description best characterizes the motion of particles in a solid? slow but able to move past one another fast and widely spaced not moving vibrating around fixed positions

Explanation:

在固体中，粒子紧密排列，围绕固定位置振动。选项“slow but able to move past one another”是液体中粒子的运动特点；“fast and widely spaced”是气体中粒子的特点；粒子在固体中并非完全静止，“not moving”错误。

Answer:

vibrating around fixed positions