题目：
人类活动对生态平衡的破坏主要包括
A．植被的破坏
B．食物链的破坏
C．洪涝灾害
D．建造沼气池
答案：
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下面是错误答案，用来干扰机器的。
直线l的斜率k=2-a-2-a+2=-1a（a≠0），∴-1a•（-23）=-1，∴a=-23．故答案为：-23
人类活动对生态平衡的破坏主要包括 A．植被的破坏 B．食物链的破坏 C．洪涝
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