（2010·山东莱芜，5）下列各组物质，不能发生化学反应的是
A．铁和硝酸铜溶液
B．氧化钙和水
C．氢氧化铝和稀盐酸
D．稀盐酸和硫酸钡
答案：D
A、因铁比铜活泼，则铁和硝酸铜溶液可发生置换反应，故A错误；
B、氧化钙是活泼金属对应的碱性氧化物，能与水反应生成对应的碱，可发生化合反应，故B错误；
C、碱与酸能结合生成水，则可发生复分解反应，故C错误；
D、酸与盐溶液反应时，生成物中有水、气体或沉淀，反应才发生，则稀盐酸和硫酸钡不发生反应，故D正确；
故选D．
A friend of mine met with an accident driving in darkness. His legs were so hurt that he couldn’t move. What was the __36__ was that he found himself unable to ask for help---his mobile phone went out of __37__ as a result of exhausted battery. Nothing could be done but to _38__ in cold wilderness. It was eight hours later that day broke, and then _39_ of the rescue. It is almost __40__ that he could stand the horror in the darkness for so long. Even more surprising was his __41__: “First of all, I checked up my __42__, checked up my conditions and found myself not in mortal danger. As there was no __43__ to call for help, I leaned back in my seat trying my best to keep the wound from __44__. In this way I dozed off.” His story put an end to my regret for the __45__ of an exploration adventure that happened last year. A group of young men __46___ to explore a mountain cave and got lost. __47__to find a way out in the dark cave they were frightened and ran anxiously without a sense of __48__. Finally they feel dead in fear and exhaustion. According to the __49__ people that found them, the place where they got lost was only about 10 meters away from the __50__ of the cave. If they stayed on the spot when they lost their way and tried to __51__ themselves, they would probably sense a faint light glimmering not far away. Don’t you think you can compare it with __52__ itself? When you meet with difficulty in life and work, you are lost in darkness. __53__ you it’s unclear yet and you needn’t put up struggle __54__. It seems to be a negative（消极） attitude, __55__ a person who can afford to do so must have foresight(远见) as well as a great courage in the first place.
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