Trees around us are extremely important and have always been necessary for improving the human conditions. Our existing forests and trees we plant work to make abetter world. . Here is a short list of main reasons trees are necessary for improving our living conditions.

●Trees produce oxygen

.A leafy tree produces as much oxygen in a season as 10 people inhale in a year.What many people don't realize is that the forest also acts as a giant filter that cleans the air we breathe. Trees help clean the air by preventing airborne particles, reducing heat, and absorbing such pollutants.

●Trees clean the soil

      The term phytoremediation is a fancy word for the absorption of dangerous chemicals and other pollutants that have entered the soil. Trees filter(过滤) sewage and farm chemicals, reducethe effects of animal wastes, clean roadside spills and so on.

●Trees are carbon sinks

       To produce its food, a tree absorbs and locks away carbon dioxide in the wood,roots and leaves. Carbon dioxide is a global warming suspect. . Thislocking－upprocess “stores” carbon as wood and not as a “greenhouse” gas.

●

        Trees block urban noise almost as effectively as stone walls. Trees, planted atstrategic points in a neighborhood or around your house, can reduce major noises from freeways and airports.

A．We could not exist as we do if therewere no trees

B．Trees help clean the sky

C．A forest is a carbon storage area thatcan lock up as much carbon as it produces

D．Trees controlnoise pollution

E．Man has been planting trees to makethe planet a more beautiful world

F．The modern human community has othermore practical reasons to admire and honor trees

G．Trees can either store harmfulpollutants or change the pollutants into less harmful forms

        This is a story of a little girl and her grandmother. One day, I was looking formedicine in a store I saw an old woman with a little girl in her arms. Thelittle girl asked her grandmother，“ do you think about a brand new face cream that is supposed (reduce)laugh lines？”The grandmother just laughed and said, “Sweetie, I am 80 years old. I(learn) to love all my laugh lines. I have (actual) earned every one ofthem.” Then just to prove her point, she laughed again and amused granddaughter. The laughter of the little girl and the old woman mixed togetherwith a sound was as musical and beautiful as an angel's song.

Ileft the store feeling a lot (good) about all the laugh lines I had earnedin my own life. I remembered all the beautiful faces I had seen the years.Their beauty is ageless no matter how old they are. May you have a time in yourlife earning most attractive laugh lines.

— Oh, ________

—Yes.I ________a better job at a software company.

—Sorry，I'm afraid it's beyond my________.

       It was unusually quiet in the emergency room on December 25. I didn't think there would be any1 ， sighing about having to work on Christmas.Just then five bodies2at my desk，a pale woman and four children.

“Areyou all3？”Iasked.

“Yes，” she said weakly and lowered herhead.

      But when it came to4of their problems，things got a little uncertain.Two of the children had headaches，two children had earaches，5only one could tell me which ear was affected.The6complained of a cough but seemed to workto produce it.

Ididn't say anything but7that it might he a little while8adoctor could see her.She responded，“9yourtime；it'swarm in here.”

      Then，I checked their chart.No address—theywere10.The waiting room was warm.

I went back to the nurses station and mentioned we had a homeless11inthe waiting room.The nurses，complaining of12on Christmas，turnedto sympathy for a family just trying to get13on Christmas.The teamwent into action，muchas we do when there's a14emergency.But this was a Christmas emergency.

        We were all15a free meal on Christmas Day，sowe took back that meal and prepared a big dinner for our16.We needed presents.We17from different departments candies，fruits and other things18thatcould be presents. As seriously as we met the19needs of the patients，our team worked to meet the needs of afamily who just wanted to be warm on Christmas.

Later，as the family walked to the door to20 ， the four­-year-­old boy came runningback，gaveme a hug and whispered，“Thanksfor being our angels today.”

—Yes.He ________a newspaper in his room.

       Many years ago，my dad was facing a serious heart condition.He was unable to do a steady job.He fell suddenly ill and had to be admitted to the hospital.

       He wanted to do something to keep himself busy, so he decided to volunteer at the local children's hospital.My dad loved kids.It was the perfect job for him.He ended up working with the seriously ill children.He would talk，play, and do arts with them.

       One of his kids was a girl with a rare disease that paralyzed(瘫痪)her from the neck down.She couldn't do anything，and she was very depressed.My dad decided to try to help her.He started visiting her in her room，bringing paints，brushes and paper.He stood the paper up，put the paintbrush in his mouth and began to paint.He didn't use his hands at all.All the while he would tell her, “See，you can do anything you set your mind to.''

       At the end of the day, she began to paint using her mouth，and she and my dad became friends.Soon after, the little girl was sent home because the doctors felt there was nothing else they could do for her.My dad also left the children's hospital for a little while because he became ill.Some time later after my dad had recovered and returned to work，in came the little girl who had been paralyzed and only this time she was walking.She ran straight over to my dad and hugged him really tight.She gave him a picture she had done using her hands.At the bottom it read：”Thank you for helping me walk.''

       My dad would cry every time he told US this story and so would we.He would say sometimes love is more powerful than doctor, and my dad—who died just a few months after the little girl gave the picture—loved every single child in that hospital.