3. Deforestation as well as soil, air and water pollution are usually the main _____ of species endangerment.
(A) exploitations
(B) culprits
(C) stigmas
(D) entailments
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統計: A(67), B(255), C(46), D(44), E(0) #2905527
統計: A(67), B(255), C(46), D(44), E(0) #2905527