问题
选择题
括号内是区别下列各组常见物质的试剂方法，其中错误的是[ ]
A．硬水与软水 ( 肥皂水，振荡)
B．水与双氧水（加入少量二氧化锰粉末）
C．二氧化碳与氮气(燃着的木条)
D．食盐水与蒸馏水（蒸发）
答案
答案：C
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括号内是区别下列各组常见物质的试剂方法，其中错误的是[ ]
A．硬水与软水 ( 肥皂水，振荡)
B．水与双氧水（加入少量二氧化锰粉末）
C．二氧化碳与氮气(燃着的木条)
D．食盐水与蒸馏水（蒸发）
答案：C
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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