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大街上发生了一宗命案,一个男子倒毙在地上,后脑被硬物击中,自行车撞在一根路灯柱上。男子死亡的地点离路灯柱约两米,腿部微曲,身体后仰。警长在现场调查,分别找到两位证人。证人甲指着乙说:“我见到他用一块小石头掷向正在行驶的自行车上的人的后脑,那个男人被石头击中后,倒在地上,接着自行车便撞向路灯柱。”但是,证人乙却说:“简直是荒谬,我可不是那样无聊的人。我见到那辆自行车飞驰而来,撞向路灯柱,车手被弹下车,后脑着地,刚好碰到地上的硬石,所以死亡。”两个人争执不下,但是,在现场找不出可以作证的凶器,满地碎石,却是事实。可警长指着乙说他是说谎者。警长为什么这样说呢?
A murder took place on the street, a man dead on the ground, the hindbrain was hit by hard objects, bicycles hit a lamppost. The location of the man’s death from the lamppost about two meters, legs slightly curved, body backwards. Sheriff in the field investigation, respectively, to find two witnesses. Witness A pointed at B and said: “I saw him throwing a small stone on the back of a man on a running bicycle that hit the ground, fell to the ground, and hit a lamppost. However, witness B said: ”It’s ridiculous, I’m not that boring person.I saw the bicycle speeding, crashing into the lamppost, the driver was dropped off, the brain ground, just hit the ground Hard rock, so death. “” Two people can not dispute, however, at the scene can not find a weapon that can testify, Montreal gravel, it is a fact. May the sergeant point to B that he is a liar. Why did the sergeant say this?