試卷：無年度 - 98年8月托福閱讀試題#20931
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 98年8月托福閱讀試題#20931
科目：TOEFL(Test of English as a Foreign Language)托福
49. According to the passage, natural evolutionary change is different from changes caused by humans in that changes caused by humans
(A) are occurring at a much faster rate
(B) are less devastating to most species
(C)affect fewer ecosystems
(D) are reversible
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