TOEFL IBT Practice Questions - Test Of English As A Foreign Language Internet-based Test Exam

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Read the passage: A professor studying ancient trade routes found seashells hundreds of kilometers inland. The shells were not local, and they appeared in layers dated before the first known roads in the region. The professor argues that exchange networks probably existed earlier than previously thought. What can be inferred from the passage?

The professor believes formal roads were necessary for trade The seashells provide evidence of movement or exchange before known roads The region was once completely covered by ocean The shells were placed in the soil by modern researchers

Correct Answer:

The seashells provide evidence of movement or exchange before known roads

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