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【单选题】
Economists who are asked to choose between two different government policies may disagree because:A.
. they make different value judgments about the desirability of the policies.
B.
. they are basing their conclusions on models that make different simplifications.
C.
. as a matter of course, economists often take opposing points of view so that all sides of a question may be discussed.
D.
. they make different value judgments about the desirability of the policies and because they are basing their conclusions on models that make different simplifications.
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