题目内容
正常情况下，大多数种群个体的数量基本都是稳定的，种群的数量在环境承受容量K值上下波动。
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Suppose you are Li Ming. During the week-long holiday, you joined a package tour organized by a travel agency to the city of Beijing. But when you got there, you found the services provided for you rather disappointing. Then you decided to writer a letter to the General Manager to 1) state your purpose of writing, 2) complain about the services, and 3) make some suggestions. You should write about 100 words. Do not sign your own name at the end of the letter. Use "Li Ming" instead. Do not write the address.
(厦门大学，2004)一种生物的绝种对生物圈的影响十分有限。
(厦门大学，2004)海洋生态系统可以大致分为海岸区，近海区和远洋区三个大区。
种群的空间分布类型包括均匀分布、随机分布和聚集分布。
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