Organisms have a great variety of ways of adapting. They may adapt in their structure, function, and genetics; in their development and production of the young; and in other respects. An organism may create its own environment, as do warm-blooded mammals, which have the ability to adjust body heat exactly to maintain their ideal temperature despite changing weather. Usually adaptations are an advantage, but sometimes an organism is so well adapted to a particular environment that if conditions change, it finds it difficult or impossible to readapt to the new conditions.
　　1. Some plants and animals develop superior characteristics so that they may
　　A) help others of their kind get food, shelter and other things needed.
　　B) survive even in extremely severe conditions.
　　C) become better adapted to the environments than others of their kind.
　　D) result in the evolution and production of more intelligent organisms.
　　2. In the first paragraph, the word "environments" could best be replaced by
　　A) contexts.
　　B) surroundings.
　　C) neighbors.
　　D) Enemies.
　　3. It can be inferred from this passage that the feathers of a bird are colored
　　A) to frighten its enemies.
　　B) to attract its enemies.
　　C) to adjust its body heat.
　　D) to match its environment
　　4. Which of the following is not directly mentioned in the passage?
　　A) A living thing way adapt in its structure.
　　B) An organism may adapt in its function.
　　C) A living creature may adapt in its genetic makeup.
　　D) A living organism may adapt in its sleeping habit.
　　5. The author cites the behavior of warm-blooded mammals in order to that a living thing may have the ability
　　A) to create an environment of its own.
　　B) to remain still when an enemy is near.
　　C) to make food from inorganic chemicals.
　　D) to change the color of its skin.
　　KEYS: CBDDA