Set 3: Inferences

Explanation

Answer: A

PASSAGE

Crows can recognize individual human faces and remember them for years. In one study, crows that had been captured and tagged would scold and dive-bomb the researchers who had handled them, while ignoring other people walking nearby.

What can be inferred about crow cognition?

A. They cannot distinguish between different humans.✓ Correct

B. They can form lasting memories and recognize specific individuals.

C. They attack all humans equally.

D. Crows have poor long-term memory.

Detailed Explanation

This question asks you to draw a logical conclusion from the text. Crows targeted specific researchers 'for years' while ignoring others—proving face recognition and long-term memory. A valid inference must be supported by evidence in the passage, even if not stated directly. Look for clues in the text that strongly suggest the answer. Avoid conclusions that require assumptions beyond what's written. Valid inferences are strongly supported by multiple pieces of evidence in the text. Be cautious of choices that go too far beyond what the passage actually states. The best inference is the one most directly supported by textual evidence.

Key Evidence:

• "recognize individual human faces"

• "remember them for years"

• "ignoring other people"

Why others are wrong: A (They distinguished researchers from others.), C (They 'ignored other people.'), D ('Remember for years' = good long-term memory.).

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