2026年7月托福机经套卷(第1套)Listen to an Academic Talk / 24 道题

Listen to an Academic Talk / 2

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What is the science podcast mainly about?

AMicrobes released by thawing permafrost.

BA new Arctic hiking trail.

CThe history of carbon dioxide research.

DHow to build climate models.

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正确答案：A

Why do microbes matter when permafrost thaws?

AThey release greenhouse gases by decomposing organic material.

BThey prevent ice from melting.

CThey create new forests immediately.

DThey stop methane from forming.

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正确答案：A

What point does the speaker make about permafrost carbon?

AIt holds about double the carbon in the atmosphere.

BIt contains no organic material.

CIt is found only in oceans.

DIt cannot be measured.

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正确答案：A

What do researchers use to study the issue?

ASophisticated models and data on microbial species.

BOnly satellite photographs.

CAncient maps.

DStudent surveys.

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正确答案：A