The following text discusses animal intelligence.
Crows demonstrate remarkable problem-solving abilities. In laboratory experiments, they bend wire into hooks to retrieve food from tubes. Wild crows have been observed using cars to crack nuts, placing them on roads and waiting for traffic. These behaviors suggest cognitive abilities previously thought unique to primates.
What is the main purpose of the text?
To compare crow intelligence to that of all other birds
To explain the biological structure of crow brains
To provide evidence of crows' advanced problem-solving
To argue that crows should be protected as endangered
Correct Answer: C
Choice C is the best answer. The text provides specific examples (wire bending, using cars) as evidence of crows' problem-solving abilities.
- Evidence: The text claims crows have "remarkable problem-solving abilities." It cites examples: "bend wire into hooks" and "using cars to crack nuts."
- Reasoning: These examples serve as proof for the initial claim of intelligence.
- Conclusion: The purpose is to provide this evidence.
💡 Strategy: Identify the main claim (crows are smart) and the supporting details (examples of smart behavior).
Choice A is incorrect because other birds aren't compared. Choice B is incorrect because brain structure isn't discussed. Choice D is incorrect because endangered status isn't mentioned.