题目内容
地衣中的藻类和真菌是一种竞争的关系。
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行为的适应性是指行为符合__________原则，即行为的__________大于其__________。
生物圈的能量流转以__________为主要传送带，传递的次序依次是__________、__________和__________。能量传递的规律是__________。出现该规律的原因是：(1)__________，(2)__________，(3)__________。
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。
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.
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