①收入差距缩小使得居民的消费结构明显改善

②我国经济稳定增长，人们收入不断增加

③人们消费方式的变化助推快递业持续发展

④消费观念的变化使人们的消费行为更加理性

                                                                                        Everyone (人人)needs to be healthy.
   Do you eat healthy food every day? It’s important (重要)for your health. You need fruit, like oranges, apples and bananas. “ An apple a day can keep away（避开） the doctor (医生).” You also need vegetables, like carrots and broccoli. Fruit and vegetables are good for our health. But don’t eat lots of chocolate. It’s not good healthy food. What about dessert? Don’t eat lots of dessert because it’s not good for your health. Many people eat lots of chocolate and dessert, so they are unhealthy. Sports can also keep you healthy. Play sports every day. Don’t be lazy. You can be healthy.

如图所示，风光互补路灯是利用风能和太阳能进行供电的智能路灯，同时还兼具了风力发电和太阳能发电两者的优势，为城市街道路灯提供稳定的电源．请找出一个与智能路灯相关的物理现象，并指出对应的物理知识．（不得与示例重复）

示例：物理现象：路灯发光

物理知识：电能转化为光能

物理现象： ____；

物理知识： ____

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下列说法正确的是(  )