Witkins rightly argues that population may be deemed a valid sustain

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问题          Witkins rightly argues that population may be deemed a valid sustainable
      development indicator—that sustainability can only be implemented by limiting
      population below the carrying capacity of the Earth. This thesis works relatively
Line    well when one presupposes that global per capita consumption is homogenous,
(5)    and that the global ecosystem can perform with uniform effectiveness the tasks
      of supplying resources and assimilating wastes, but in reality population effects
      vary widely due to vast regional differences in ecosystem characteristics. While
      large populations exert considerable stress on their ecosystems,  small
      populations with high rates of consumption can eclipse the effect of larger
(10)    populations operating at lower rates of consumption. Per capita consumption of
      energy may exponentially exceed the physiological energy requirements of
      humans, requiring that both population and consumption be taken into account.
      Witkins thus ignores the corollary that the impact of population tends to be more
      significant on a national level than that of consumption adjusted population, but
(15)    on a global level, the opposite obtains. [br] It can be inferred from the passage that the author would argue that in determining population effects physiological energy requirements tend to be

选项 A、entirely superfluous
B、globally consistent
C、not wholly explanatory
D、supremely crucial
E、unfortunately complicated

答案 C

解析

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