题目

        36    Sometimes they try to get out of a class to escape a teacher they don’t like. Here is some advice to solve this problem. Ask yourself, “What can I learn from this teacher?” Even if you don’t worship (崇拜) his or her personality or lectures, dig deep until you find a subject in which he or she is very knowledgeable. Focus on that part of the teacher’s personality, and use him or her as a tool for learning. Not only will you gain more knowledge in that subject, but a closer relationship with your teacher may help you understand one another better.  关于质量守恒定律,下列叙述中正确的是 [  ] A.煤燃烧化为灰烬,固体质量减少,该反应不符合质量守恒定律 B.24g镁条在空气中完全燃烧生成40g氧化镁,固体质量增加,该反应不符合质量守恒定律 C.一切化学反应都遵从质量守恒定律 D.质量守恒定律只适用于有气体或固体生成的化学反应
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