2026年4月托福机经套卷(第5套)Listen to an Academic Talk4 道题

Listen to an Academic Talk

共用材料

共用录音 1

What is the main purpose of the talk?

ATo contrast two ways of fish farming

BTo explain a naturally occurring process

CTo present the advantages and disadvantages of fishponds

DTo discuss a commercially valuable fish species

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正确答案：A

What does the speaker point out about algal blooms?

AThey are common in the ocean around Hawaii.

BThey produce a lot of nutrients.

CThey cannot occur where fish farming is practiced.

DThey can kill other aquatic life.

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正确答案：D

Why does the speaker refer to agricultural fields?

ATo explain the idea of fish farming

BTo identify a source of nutrients in water

CTo emphasize the need for fertilizers today

DTo point out that people in ancient Hawaii had different food sources

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正确答案：B

What does the speaker say about the sluice gates used in ancient Hawaiian fishponds?

AThey were destroyed after the fish in the ponds were harvested.

BThey could open and close automatically with incoming and outgoing tides.

CThey allowed young fish to enter the ponds and kept older fish inside them.

DThey prevented agricultural runoff from nearby fields from entering the ponds.

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正确答案：C