点P（x，y）在直线x+y-4=0上，则x²+y²的最小值是______．

There are two faces of nature. One is good while the   小题1:  is bad. It all depends on   小题2:you look at it. I believe that nature is man’s friend and we should treat it with a great deal of respect. 小题3:  trip to the mountains on the weekend will give a glimpse  小题4:  how beautiful nature is and can be.

Unfortunately, due to our busy lives, many of us take this beauty for granted. We keep spoiling our environment instead of protecting  小题5:. Because of the harm  小题6:  was caused by humans, nature has turned on (attacked suddenly) us.  小题7:  a result, storms and landslides are taking place more than ever before. If we don’t take the time to protect our environment, nature will no longer be our friend,   小题8:  our biggest enemy.