試卷：無年度 - 98年5月托福閱讀試題#20930
| 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5月托福閱讀試題#20930
科目：TOEFL(Test of English as a Foreign Language)托福
4.Why does the author believe that the Mandans were skilled farmers?
(A) They developed effective fertilizers.
(B) They developed new varieties of corn.
(C) They could grow crops in most types of soil.
(D) They could grow crops despite adverse weather.
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