2026年3月托福机经套卷(第3套)Listen to an Academic Talk / 24 道题

Listen to an Academic Talk / 2

共用材料

共用录音 1

What is the main topic of the talk?

AChemical reactions that occur within soap bubbles

BHow light produces shifting colors on certain surfaces

CHow research on the behavior of light in science has evolved

DThe drawbacks and benefits of using soap bubbles in experiments

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正确答案：B

According to the talk, what must happen to light waves for constructive interference to occur?

AThey must cancel each other out.

BThey must be absorbed by the bubble.

CThey must align to amplify their effects.

DThey must reflect only from the outer surface.

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正确答案：C

According to the talk, why do the colors on a soap bubble keep shifting?

ABecause air currents scatter the light unevenly

BBecause pigments inside the bubble move around

CBecause the bubble absorbs different colors as it grows larger

DBecause certain features of the light and the bubble keep changing

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正确答案：D

Why does the speaker mention the fragility of soap bubbles?

ATo highlight a challenge in mimicking soap bubble designs

BTo provide an example of the inefficiency of designs in nature

CTo explain why soap bubbles are used in scientific experiments

DTo suggest that soap bubbles can actually be used to create durable materials

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正确答案：A