19.C解析:植树种草能防风固沙,是生物多样性的生态学功能,体现了生物多样性的问接价值,A错误:沙漠治理既丰富了群落的水平结构,也使垂直结构复杂化,B选项错误:沙漠变绿洲增大了生产者的数量,提高了固定CO2的能力,有利于降低大气CO2浓度,缓解温室效应,C选项正确:治理后“沙漠"抵抗力稳定性提高,D选项错误。

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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