TOEFL Listening

Campus conversations and academic lectures with transcript placeholders until user-supplied audio is added.

36:00

Question 1 of 8Use A-D, 1-4, Left/Right to choose, Enter to continue, and Ctrl+B

Listening transcript

Professor: The key point is not that wetlands remove every pollutant. Rather, they slow water movement, allowing sediment and attached chemicals to settle before water reaches rivers.

What is the professor mainly explaining?

A.How wetlands can reduce some pollutionB.Why rivers move more quickly than wetlandsC.How to build artificial river channelsD.Why all pollutants disappear in wetlands

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