試卷：無年度 - 2002年1月托福閱讀#20904
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 2002年1月托福閱讀#20904
科目：TOEFL(Test of English as a Foreign Language)托福
40. What does the passage mainly discuss?
(A) How insects use pheromones to communicate
(B) How pheromones are produced by insects
(C) Why analyzing insect pheromones is difficult
(D) The different uses of pheromones among various insect species
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