gre考试阅读真题解析(A)_GRE阅读

　　20. According to the passage, which of the following is a true statement about density-dependent factors in population growth?

　　 They ultimately account for long-term population levels.

　　 They have little to do with long-term population dynamics.

　　 They are always more easily isolated and described than those that are density-independent.

　　 They include random environmental events.

　　 They contradict current ecological assumptions about population dynamics.

　　21. According to the passage, all of the following behaviors have been exhibited by different populations EXCEPT:

　　 roughly constant population levels from year to year

　　 regular cycles of increases and decreases in numbers

　　 erratic increases in numbers correlated with the weather

　　 unchecked increases in numbers over many generations

　　 sudden declines in numbers from time to time

　　22. The discussion concerning population in lines 24-40 serves primarily to

　　 demonstrate the difficulties ecologists face in studying density-dependent factors limiting population growth

　　 advocate more rigorous study of density-dependent factors in population growth

　　 prove that the death rates of any population are never entirely density-independent

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