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21.【参考答案】(1)岛屿周边的滨海平原分布着广阔沙滩，成为风沙的沙源地：冬夏季风由海洋吹来，风力较大，有大半年时间风力可达6级以上，大风将沿海沙滩物质吹扬岛上，引起风沙：岛屿无高大山地阻挡，风沙弥漫整个岛屿：森林覆盖率低，大面积裸地成为沙源地，增强风沙危害。（每点2分，任答其中3点得6分）(2)夏季接受太阳辐射多，气温高，受东南季风影响，多降雨天气，利于木麻黄幼苗的成功定植：(2分)夏季可以免除寒潮带来的低温冻害。(2分)【解析】第(1)题，从风力、植被、地形、沙源地等方面分析东山岛风沙危害严重的自然原因。第(2)题，从降水、气温等方面人手，阐释与3月份相比，夏季能够保障木麻黄幼苗成功定植的自然条件。

第二节书面表达In order to celebrate the moment of Senior 3 studentsstepping into the adult world,a coming-of-age ceremonywas held at 3:00 pm last week at the school square.Everyone present witnessed the glorious moment.First,a student representative delivered a speechthemed "Youth and Responsibility",which was bound tolight our passion for a wonderful future.Then came thetouching section,where our dear parents and teacherspresented us with some gifts.What an unforgettable sceneit was!At last,we yelled out our determination andwishes for the future to end the ceremony and start ourbrand-new life.Through this activity,I realize I have grown up and Ishould take more responsibilities in my life!