从分别写有0,1,2,3,4的五张卡片中取出一张卡片，记下数字后放回，再从中取出一张卡片．则两次取出的卡片上的数字之和恰好等于4的概率是________．

假设你是李华,在美国探亲。2005年2月8日清晨,你目击一起交通事故。警察局让你写一份材料,报告当时所见情况。请根据下列图画写出报告。

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