試卷：無年度 - 2003年10月托福閱讀#20898
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 2003年10月托福閱讀#20898
科目：TOEFL(Test of English as a Foreign Language)托福
20. What does the passage mainly discuss?
(A) The mass migration of ants
(B) How ants mark and follow a chemical trail
(C) Different species of ants around the world
(D) The information contained in pheromones
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