下列说法正确的是（ ）
A．生成盐和水的反应，一定是中和反应
B．生成单质和化合物的反应，一定是置换反应
C．有盐生成的反应，一定是复分解反应
D．有氧气参加的反应一定是氧化反应
A、中和反应由一种或几种物质生成一种物质的化学反应，生成盐和水的化学反应，生成物有两种物质，肯定不是化合反应，故A错误；
B、置换反应是由一种单质和一种化合物反应生成另一种单质和另一种化合物的反应，所以从定义看，生成单质和化合物的反应不一定是置换反应，对反应物的种类也应该有要求的，故B错误；
C、复分解反应是由两种化合物生成另外两种化合物的反应，所以“有盐生成的反应，一定是复分解反应”这种说法是没有道理的，故C错误；
D、物质跟氧发生的反应叫做氧化反应，所以“有氧气参加的反应一定是氧化反应”是正确的说法，故D正确；
故选D
| 完形填空。 | ||||
| When I arrived in Hamburg Germany, my colleague who worked there arranged a welcome party for me in a 1 . We noticed a few customers including several old ladies, were having their meal. When a dish is 2 , the waiter would distribute the food for them, and they would 3 every bit of the food on their plates. As I was hungry, my local colleague 4 much food for me. Since there were other things to do, we did not 5 much time dining. When we planned to leave, there was still about one third of 6 food left. When we were leaving the restaurant, we 7 someone calling us. When the old ladies spoke to us in English, we understood that they were 8 about us wasting so much food. "We 9 for our food; it is none of your 10 how much food we left behind", my colleague told the old ladies. They got angry, and one of them 11 made a call to someone. After a while, an officer in 12 arrived. Upon knowing what had happened, he issued us a 50-euro 13 . The officer told us in a stern (严厉的)voice: "order 14 you can consume. Money is yours, 15 the resources belong to the society. You have no 16 for wasting them." Our face turned red. We all agreed with him in our 17 . My colleague took out a 50-euro note and repeatedly 18 to the officer. My colleague copied the fine ticket and gave a copy to each of us as a souvenir. We all 19 it to remind us that we should never be 20 . | ||||
|