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【单选题】
在请求分页式存储管理，能使用户程序大大超过内存的实际容量。虚存的实现实际上是利用（ ）为用户构建一个虚拟空间。A.
内存
B.
外存
C.
联想存储器
D.
页表
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举一反三
【单选题】Economics proceeds by making models of ( ), which are simplified representations of reality.
A.
social phenomena
B.
people’s imagination
C.
stories
【单选题】Economics models __________________.
A.
are used as detailed representations that include all aspects of an environmental issue
B.
can be useful for creating solutions to environmental problems if the assumptions are accurate
C.
are likely to produce the same conclusions about environmental issues despite changes in the model's assumptions
D.
can be used to create accurate and concise representations of environmental problems
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