2026年2月托福机经套卷(第7套)Listen to an Academic Talk4 道题

Listen to an Academic Talk

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What similarity between the horseshoe crab and the blue-ringed octopus does the speaker point out?

ABoth produce compounds with medical uses.

BBoth depend on bacteria to survive.

CThey have nervous systems.

DThey exhibit similar survival behaviors.

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正确答案：A

What does the speaker explain by mentioning sodium channels in nerve cells?

AHow the blood of the blue-ringed octopus is adapted to the animal's environment

BHow a venom works

CHow bacterial contamination can affect some products

DHow the blue-ringed octopus moves

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正确答案：B

How does the venom of the blue-ringed octopus affect its prey?

AIt causes the prey to lose blood.

BIt makes the prey confused.

CIt prevents the prey from feeling pain.

DIt makes the prey unable to move.

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正确答案：D

Why does the speaker discuss spiders?

ATo contrast neurotoxic venoms with other types of venoms

BTo point out another example of protection from one's own venom

CTo clarify how electrical signals travel across nerve cells

DTo identify a discovery that was made by accident

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正确答案：B