2026年4月托福机经套卷(第3套)Listen to an Academic Talk / 24 道题

Listen to an Academic Talk / 2

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共用录音 1

Why does the speaker talk about arches in architecture?

ATo point out a similarity to rock arches in nature

BTo help illustrate an important concept

CTo argue against a common comparison

DTo show a difference between life science and technology fields

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正确答案：B

According to the talk, what is a keystone species?

AA species that is necessary to maintain balance in an ecosystem

BA species that has no predators within an ecosystem

CA species that is too numerous for a healthy ecosystem

DA species that is negatively affected by environmental changes

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正确答案：A

In the early 20th century, what happened to the wolves in Yellowstone National Park?

ATheir population increased dramatically when their prey population increased.

BThey became a government-protected species.

CThey were eliminated over farming and safety concerns.

DTheir population decreased significantly because of disease.

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正确答案：C

How did an increasing elk population affect the Yellowstone ecosystem?

AMany species were negatively affected due to the elks' diet.

BVarious animals that prey on elk were attracted to the area.

CSome areas developed an overgrowth of plants while others had too little vegetation.

DThe population and range of the wolves also increased.

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正确答案：A