题目：
环境的不可逆变化，如水土流失、土地沙漠化等主要是由（）引起的。
A.自然干扰
B.人为干扰
C.自然促进
D.人为促进
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
环境的不可逆变化，如水土流失、土地沙漠化等主要是由（）引起的。A.自然干扰 B.人为
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