下列属于化学变化的是（ ）
A．酒精挥发
B．卫生球升华
C．灯泡发光
D．动植物呼吸
A、酒精挥发的过程中没有新物质生成，属于物理变化．故错误；
B、卫生球升华的过程中只是物质的状态发生了改变，没有新物质生成，属于物理变化．故错误；
C、灯泡发光的过程中没有新物质生成，属于物理变化．故错误；
D、动植物的呼吸作用过程中，氧气和有机物发生了化学反应，生成水和二氧化碳等物质，属于化学变化．故正确．
故选D．
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| 请认真阅读下面短文，然后从短文后各题所给的A、B、C、D四个选项中，选出一个最佳 选项。 As we all know, the environment around us is getting worse and worse. In some places we can’t see fish 1 in the river or trees on the hills. Some people even have no clean water to drink. Recently, a new lifestyle called low carbon life is 37 2 every comer of our country. The meanings of low carbon are 3 energy and no waste. It is such an important project that I can’t wait 4 my ideas on how to promote it. First，we should 5 a no-car day every week in our school. Because cars not only cause serious air pollution but also waste energy. 6 the no-car day, neither students 7 teachers are allowed to drive to school. At the same time，just walk or run. Use our 8 and enjoy the fun. Second, we had better not use plastic bags 9 . No one can stand the “white pollution”， 10 it is wise to use cloth bags which can 11 again and again. 12 ，one thing 13 we should keep in mind is that every big thing comes from the small details. So, as students, we ought to turn 14 the lights the moment we leave, use 15 sides of the paper, and reuse our textbooks and so on. All in all, it weighs greatly for all of us to put the low carbon lifestyle into practice. Just set our mind to these：no-car days, no plastic bags, and no waste. Let’s do it now. | |||
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