被称为“地球之肺”的是（ ）
A．草原
B．河流
C．沼泽地
D．森林
森林所在地区一般土壤肥沃，雨量充沛，生活着种类繁多、形态各异的植物、动物和其他生物．热带雨林不仅为生物提供了理想的生存环境，更重要的是，它通过光合作用吸收了大量的二氧化碳，转化为有机物，储存在植物体内；同时，释放出大量的氧气，维持了生物圈中的碳----氧平衡，因而被称为地球的“肺”．
故选D
It was the golden season. I could see the leaves falling with the cool wind. For others, it is a harvest season, while for me, it is a（n） season. I was for the Postgraduate Entrance Examination. But so many unhappy things made me so tired, so I decided to have a walk along the Yanjiang Road in my university. “Autumn is a lonely season and life is uninteresting. The days in this season always get me ”, I thought when the sound of a guitar flowed into my ears, like a stream flowing from the mountains. A young girl, sitting on the lawn, was lost in playing her guitar. She was a beautiful girl, when the wind blew her long hair. I had never seen her before. The music was so attractive that I listened quietly. Lost in the music, I did not that I had been standing for so long. But my existence did not seem to disturb her. Leaves were still falling. Every day when I passed by the lawn, I would see her playing her guitar. She was the only and I was the only audience. During the rest of the days in the season, life became and I could review the courses carefully. Autumn was over. One day, when I was listening devotedly, the sound suddenly stopped. To my surprise, the girl came over to me. “You like the music,” she said. “Yes, you play very well. Why did you stop?” I asked. Suddenly, a expression appeared on her face. “I came here just to have a rest because I in the college entrance examination. I felt very disappointed. And it was your listening every day that me,” she said, “and I have to go tomorrow.” “In fact, it was your playing that gave me a autumn and helped me believe that I have the ability to pass the Postgraduate Entrance Examination.” I answered, “I think it was God who gave us the to know each other and we should be good friends.” She smiled and I smiled in that beautiful autumn..
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