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
44. The passage suggests that the speed at which communication through
pheromones occurs is dependent on how quickly they
(A) lose their effectiveness
(B) evaporate in the air
(C) travel through the air
(D) are produced by the body
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