第三节 人类与环境,一,二,三,一,二,三,一,二,三,一,二,三,一,二,三,一,二,三,一,二,三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,探究一,探究二,探究三,1-2,3,4,5,6,1-2,3,4,5,6,1-2,3,4,5,6,1-2,3,4,5,6,1-2,3,4,5,6,1-2,3,4,5,6,1-2,3,4,5,6,