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 talk mainly about?

AResearch into the health benefits of a modern technology

BThe unintended consequences of a technological innovation

CDifferences between artificial lighting and natural sunlight

DHow different types of light are seen by the human eye

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正确答案：B

What benefit of LED bulbs does the speaker emphasize?

ALow cost of bulb production

BLow energy use

CBrightness

DStress reduction for humans

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正确答案：B

What comparison does the speaker make between the light from incandescent bulbs and the light from LEDs?

AIncandescent bulbs emit less near-infrared light.

BIncandescent bulbs emit light from a broader range of the spectrum.

CLEDs emit a steadier light that is not subject to flickering.

DLEDs emit light that is more similar to natural sunlight.

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正确答案：B

What is the professor's concern about the advanced LED systems that some experts like?

AThey might have negative effects on mood.

BThey are unsuitable for use in medical settings.

CTheir high cost might prevent their widespread use.

DThey produce almost no near-infrared light.

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正确答案：C