Passage 2 indicates that Costanza himself considers the true

题目
单选题
Passage 2 indicates that Costanza himself considers the true value of the world's ecosys- tems to be ______.
A

a subject more for psychologists than economists

B

impossible to determine

C

likely greater than his estimate

D

independent of the value of human emotions

E

roughly equal to the value of the gross national product of the United States1

参考答案和解析
正确答案: D
解析:
这篇文章中提到Costanza保守地将成本定为33万亿美元,这表明Costanza认为这是个低估。
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