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Read the story and answer the questions to test your comprehension.

The Chihuahua, discovered in Mexico in 1850, is the smallest breed of dog in the world. Some scientists think that Chinese hairless dogs actually crossed over the Bering Strait from Asia, and mated with Aztec dogs in Mexico. They're the only animals whose skulls never harden in certain spots, making them vulnerable to injury.

  1. 1. What did the hairless dogs mate with in Mexico?
    1. a. Aztec dogs
    2. b. Mexican dogs
    3. c. Incan dogs
  2. 2. Where did hairless dogs originally come to North America from?
    1. a. China
    2. b. Russia
    3. c. Japan
  3. 3. Where was the Chihuahua discovered?
    1. a. Mexico
    2. b. Brazil
    3. c. Puerto Rico