2026年4月托福机经套卷(第4套)Listen to an Academic Talk4 道题

Listen to an Academic Talk

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共用录音 1

What does the speaker mainly discuss?

AThe historical development of incandescent bulbs

BThe impact and future potential of LED technology

CThe disadvantages of consumer use of LED lights

DThe challenges researchers face in improving LED technology

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正确答案：B

According to the speaker, what is the most significant benefit of LED lights compared to incandescent bulbs?

ALEDs produce more heat than incandescent bulbs.

BLEDs are cheaper to manufacture than incandescent bulbs.

CLEDs use less energy than incandescent bulbs.

DLEDs provide much brighter light than incandescent bulbs.

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正确答案：C

Why does the speaker mention the small size of LED lights?

ATo point out that they are useful for simple household lighting only

BTo explain why LEDs are not durable

CTo emphasize the flexibility of LEDs for different uses

DTo provide a possible reason that they are not more popular

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正确答案：C

What is the speaker's attitude toward the future of LED technology?

ADoubtful that LEDs will continue to improve

BConcerned about the cost of LED development

CEncouraged that LED products will become more affordable

DExcited about new possibilities for LED applications

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正确答案：D