2026年3月托福机经套卷(第4套)Read an Academic Passage5 道题

Unveiling Earth's Core

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Unveiling Earth's Core Geophysicists have long been intrigued by Earth's core (the center of Earth). When earthquakes occur, they send seismic waves through the planet, offering rare glimpses into this mysterious world. Interestingly, these waves sometimes slow down in unexpected ways, suggesting that the core's makeup may be more complex than just iron and nickel as previously believed. Some scientists suggest it might not be entirely solid, possibly containing molten layers or unusual elements that create a unique state of matter. Advanced computer models now depict the core not as a homogeneous sphere, but as a layered structure with distinct regions. These models also propose phenomena like super-rotation—where the inner core (the inner part of Earth's core) spins slightly faster than the rest of the planet—and directional differences in wave behavior, known as anisotropies. Collectively, these findings portray a core in constant motion. But is this picture complete? Some researchers argue that these models rely on overly simplified assumptions. Truly understanding the inner core demands cutting-edge technology and fresh perspectives. The limitations of current theories remind us that the deeper we explore planetary science, the more we challenge our understanding of it.

Question 1查看单题

Why does the author discuss earthquakes in paragraph 1?

ATo demonstrate the fascination of geophysicists with Earth's core

BTo explain one way scientists gain insights into Earth's core

CTo highlight the destructive effects of seismic waves on Earth's core

DTo challenge the idea that Earth's core is a mysterious world

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正确答案：B

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Question 2查看单题

Why might seismic waves slow down when passing through Earth's core?

ABecause of the solid nature of the core

BBecause of the presence of iron and nickel

CBecause of the possible presence of molten layers or unusual elements

DBecause of the strength of the elements that make up the core

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正确答案：C

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Question 3查看单题

The word "Collectively" in the passage is closest in meaning to

Agenerally

Btogether

Csomehow

Dinterestingly

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正确答案：B

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Question 4查看单题

Advanced computer models suggest all of the following about Earth's core EXCEPT:

AEarth's core has different layers.

BThe inner part of Earth's core rotates a little faster than other parts of Earth do.

CWave behavior in Earth's core shows directional differences.

DThe super-rotation of Earth's core is caused by anisotropies.

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正确答案：D

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Question 5查看单题

Identify the sentence in paragraph 3 that describes a specific criticism of computer models of the inner core. Select the sentence to make your choice.

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参考答案：Some researchers argue that these models rely on overly simplified assumptions.