题目内容：
在潮湿的山洼中，大量的蚂蚁、蜘蛛、老鼠等动物聚集在一堆长满苔藓的腐木中，它们共同构成一个( )
A.生态系统
B.生物群落
C.种群
D.食物网
参考答案：
答案解析：
选择题：在潮湿的山洼中，大量的蚂蚁、蜘蛛、老鼠等动物聚集在一堆长满苔藓的腐木中，它们共同构成一个( )
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教师教学导人行为的原则不包括( )
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