2026年3月托福机经套卷(第5套)Listen to an Academic Talk4 道题

Listen to an Academic Talk

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What is the main topic of the talk?

AThe critical habitats and wildlife diversity supported by wetlands

BWetlands and their various functions in ecosystems

CThreats posed to wetlands and efforts to conserve them

DWetlands as natural water filtration systems

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正确答案：B

What does the speaker mean when she calls wetlands "biochemical powerhouses"?

AWetlands clean the air by absorbing carbon dioxide and releasing oxygen.

BThe volume of water passing through some wetlands could power a factory.

CMicrobial communities in wetlands serve to filter water on a massive scale.

DToo much wetland has been destroyed for industrial and commercial use.

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正确答案：C

Why does the speaker mention carbon dioxide?

ATo describe threats to wetlands from rising sea levels

BTo show how carbon dioxide levels harm soil quality in wetlands

CTo argue for an increased need for flood management

DTo explain how wetlands help combat climate change

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正确答案：D

How does the speaker organize the talk?

AShe compares the costs and benefits associated with maintaining wetlands.

BShe illustrates the value of wetlands with examples from history.

CShe outlines the stages of restoring disturbed wetlands.

DShe lists and describes the benefits associated with wetlands.

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正确答案：D