The bird and the tree are friends．The bird often sings songs in the tree．Autumn comes．The bird has to fly to the south．Spring comes.The bird comes back，but she can’t see the tree．Grass tell her some workers cut the tree down and took him to a factory．Then the bird flies to the factory．The workers told her they cut the tree into wood．They used the wood to make matches．Then they took the matches to a village．The bird flies to the village and sees a girl used the last match to make the fire．The bird sings a sad song to the fire．

图中K，L，M为静电场中的3个相距很近的等势线．一带电粒子射入此静电场中后，仅在电场力作用下沿abcde轨迹运动．已知电势φ_K＞φ_L＞φ_M．下列说法中正确的是（   ）

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