题目内容:
WhatisthemainideaofParA.3?
A.Theexploitationisnecessaryforthepoorpeopl B.Wildernessescannotguaranteebetteruseofrawmaterial
C.Usefulservicesofwildernessesarenotthereasonfornoexploitatio
D.Allthecharacteristicsconcerningtheexploitationshouldbetreatedequall
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答案解析: