知识问答
最佳答案：不要随地仍烟头:Don't informal sill a cigarette butt节约用水:save water不要践踏草地:Don't to stamp
最佳答案：Today,there are more and more people on earth. Earth is becoming more and more c
最佳答案：If everybody takes care of our environmental protection ,then our future life wi
最佳答案：Because of having the above favorable conditions,the environmentally friendly us
最佳答案：Scientists and environmentalists are concerned about global warming.The use of f
最佳答案：Light emitting diode ( LED ) because of high efficiency,energy saving,long servi
最佳答案：Trees' being cut down and farmlands' being occupied have polluted the air, which
最佳答案：In the room and the chemical widespread use cause which as a result ofmodern arc
