1. What is the main idea of the article?, A. Animals are dangerous to humans, B. Nature has many unusual survival adaptations, C. Snails are the most intelligent animals, D. Hippos are the largest animals in Africa, 2. What is the radula in snails used for?, A. Swimming quickly in water, B. Fighting predators, C. Scraping and grinding food, D. Digging underground tunnels, 3. How many tiny teeth can a snail’s radula have?, A. 10–100, B. 100–500, C. 1,000–12,000, D. Over 1 million, 4. Why is swallowing dangerous for squids?, A. Their stomach is too small, B. Their esophagus passes through their brain, C. They cannot digest solid food, D. Their teeth are too weak, 5. What must squids do before swallowing prey?, A. Cook it first, B. Break it into small pieces, C. Freeze it underwater, D. Store it in a pouch, 6. What unusual defense mechanism does the hairy frog use?, A. It changes color rapidly, B. It releases poison gas, C. It breaks its toe bones to form claws, D. It hides underground permanently, 7. The hairy frog is often compared to which comic book character?, A. Wolverine, B. Batman, C. Spider-Man, D. Iron Man, 8. What is the red secretion of hippos mainly used for?, A. Attracting mates, B. Marking territory, C. Scaring predators with smell, D. Sunscreen and antibacterial protection, 9. Why do snails have so many tiny teeth?, A. To climb trees, B. To defend themselves, C. To help them scrape and grind food efficiently, D. To breathe underwater, 10. What does the article suggest about evolution?, A. It always creates perfect animals, B. It only works in aquatic animals, C. It aims for survival, not beauty, D. It is no longer active today.

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