问题
单项选择题
下列事件中，属于不可能事件的是( )
A．某个数的绝对值小于0
B．某个数的相反数等于它本身
C．某两个数的和小于0
D．某两个负数的积大于0
答案
参考答案：A
解析：任何数的绝对值都是非负数，故不存在绝对值小于零的数，A项为不可能事件．
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下列事件中，属于不可能事件的是( )
A．某个数的绝对值小于0
B．某个数的相反数等于它本身
C．某两个数的和小于0
D．某两个负数的积大于0
参考答案：A
解析：任何数的绝对值都是非负数，故不存在绝对值小于零的数，A项为不可能事件．
The telephone rang in the police station at Richmond, California, US. “ station? A train for Santa Fe collided (相撞) a at the McDonald Street Crossing. Please come here at once. With an ambulance, too. A man is badly wounded,” said an anxious voice of a young woman. “OK. We’ll come soon. Please stay there and wait.” Replied the policeman. Within a minute, a police car and an ambulance off. Soon they got to the crossing, but only to find everything was fine. No collision, no wounded man. “What a dirty !” said the policeman angrily. “ We must find out that woman and…” They had not been able to say anything about a when they heard the whistle of a train was nearing them quickly. All of a sudden, a truck appeared. It came towards them, too. When it was passing the crossing, it suddenly to move on. Right then and there, before the eyes of all the people present, the train collided with the truck heavily and struck it dozens of metres away. When Randolph Bruce, the driver, was helped out of the damaged truck, he was badly wounded just as the young woman had predicted on the phone. As he was taken to hospital in time, he was at last. Later the police did whatever they could to the woman who had them, but failed. It is really that a prediction should agree with the fact so .
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