为了说明影响化学反应快慢的因素，甲、乙、丙、丁4位同学分别没计了如下4个试验，你认为结论不正确的是（ ）
A．将形状、大小均相同的镁条和铝条与相同浓度的盐酸反应时，两者速率一样大
B．在相同条件下，等质量的大理石块和大理石粉末与相同浓度的盐酸反应，大理石粉末反应快
C．将浓硝酸分别放在冷暗处和强光照射下，会发现光照可以加快浓硝酸的分解
D．两只试管中分别加入相同质量的氯酸钾，其中一只试管中再加入少量二氧化锰，同时加热，产生氧气的快慢不同
A、金属的活泼性不同，其它条件相同时，化学反应速率也不同，故A错误．
B、在其它条件相同的情况下，反应物的接触面积影响化学反应速率，接触面积越大，化学反应速率越快，故B正确．
C、在其它条件相同的情况下，温度影响化学反应速率，温度越高，化学反应速率越大，故C正确．
D、在其它条件相同的情况下，温度、催化剂影响化学反应速率，温度越高且加入催化剂，化学反应速率越快，故D正确．
故选A
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| Agatha Christic would never forget the night when she met a robber (抢劫者) many years ago. That evening,she went to a birthday party which 1 until two o'clock in the morning. Agatha walked in the 2 street alone. Suddenly from the back of a dark 3 a tall man with a sharp knife in his right hand ran out at her. "Good 4 , lady," the man said in a low voice. "I don't think you wish to 5 here!" "What do you want?" "Your earrings. Take them off!" Agatha suddenly had a 6 idea. She tried to cover her necklace with the collar (衣领) of her overcoat while she used 7 hand to take off both of her earrings and then quickly 8 them on the ground. "Take them and let me go," she said. The robber thought that the girl didn't like the earrings at all, only trying to 9 the necklace. It would cost 10 , so he said, "Give me your necklace." "Oh, sir. It doesn't 11 much. Please let me wear it." "I'm not that 12 . Quick!" With shaking 13 Agatha took off her necklace. As soon as the robber left, she picked up her earrings and ran as 14 as she could to one of her friends. The earrings cost 480 pounds and the necklace the robber had taken away cost 15 six pounds. | ||||
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