2026年4月托福机经套卷(第4套)Listen to an Academic Talk / 24 道题

Listen to an Academic Talk / 2

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What is the main purpose of the talk?

ATo contrast two methods of farming

BTo describe a method for repairing damaged soil

CTo explain differences between several types of ecosystems

DTo discuss new research into microorganisms found in soil

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正确答案：B

What does the speaker point out about extracellular polymeric substances?

AThey hold soil particles together.

BThey indicate that soil is degraded.

CThey are an important nutrient source for microbes.

DThey can replace chemical fertilizers under certain conditions.

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正确答案：A

What is a reference site in the work that the speaker describes?

AA laboratory where microbes are grown.

BA location where restoration efforts have previously failed.

CA degraded area that is used for testing interventions.

DA healthy ecosystem used as a model.

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正确答案：D

What does the professor say about the California vineyard before the intervention?

AIts soil contained high numbers of bacteria.

BIts vines were infected with harmful fungi.

CIt was surrounded by forested land.

DIts soil was hard and dry.

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正确答案：D