关于树木

　　ladies and gentlemen, i want to say something about trees. as we know now trees are very important to human beings. first of all, they benefit our health.

　　they send out oxygen for us to breathe. we cant live without trees.secondly, trees can beautify our environment.

　　as trees are so important, we must do our best to protect them. we must enforce the tree protection laws. we must plant as many trees as possible.only in this way can we live happily in the beautiful world.