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
37. In the first paragraph, the wordenvironmentscould best be replaced by________.
A. contexts
B. surroundings
C. neighbors
D. enemies
38. 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
39. Which to the following is not directly mentioned? ___________.
A.A living thing may adapt in its structure
B.An organism may adapt in its function
C.A living creature may adapt in genetics
D.A living organism may adapt in its sleeping habit
40. The author cites the behavior of warm-blooded mammals in order to illustrate which of the following? __________.
A.A living thing may have the ability to create an environment of its own
B.A living creature may have the ability to find shelter for them
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