Question

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crows are intelligent animals. they can use tools and communicate with each other quite well. a recent study may have proven these birds are even smarter than scientists originally believed. researchers wanted to find out how crows responded to human beings in their environment. to do this, researchers recorded the voices of five people who regularly fed a group of crows. they also recorded voices of people the crows had never heard before. the crows reacted more to the unknown voices. researchers believe unfamiliar voices may pose more of a threat to the crows. this may explain why the crows reacted.
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crows ___ different human voices.
a imitate
b confuse
c distinguish
d avoid

Explanation:

The text says that crows reacted more to unknown voices (people they had never heard before) compared to the voices of people who regularly fed them. This implies that crows can tell the difference between different human voices.

• "Imitate" means to copy, and there is no mention of crows copying voices in the text.
• "Confuse" means to mix up, but the crows' different reactions show they are not confused but rather can tell the voices apart.
• "Avoid" is too extreme as the text only talks about reactions (more reaction to unknown voices) not about avoiding.
• "Distinguish" means to recognize the difference between things, which fits the context as crows reacted differently to different voices (recognized the difference).

Answer:

C. distinguish