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[Reading Comprehension]
试题详情
文章：
| Line | The argument for “monetizing”—or putting a | |
| monetary value on—ecosystem functions may be | ||
| stated thus: Concern about the depletion of natural | ||
| resources is widespread, but this concern, in the | ||
| (5) | absence of an economic argument for conservation, | |
| has not translated into significant conservational | ||
| progress. Some critics blame this impasse on | ||
| environmentalists, whom they believe fail to address | ||
| the economic issues of environmental degradation. | ||
| (10) | Conservation can appear unprofitable when compared | |
| with the economic returns derived from converting | ||
| natural assets (pristine coastlines, for example) into | ||
| explicitly commercial ones (such as resort hotels). | ||
| But according to David Pearce, that illusion stems | ||
| (15) | from the fact that “services” provided by ecological | |
| systems are not traded on the commodities market, | ||
| and thus have no readily quantifiable value. To | ||
| remedy this, says Pearce, one has to show that all | ||
| ecosystems have economic value—indeed, that all | ||
| (20) | ecological services are economic services. Tourists | |
| visiting wildlife preserves, for example, create | ||
| jobs and generate income for national economies; | ||
| undisturbed forests and wetlands regulate water | ||
| runoff and act as water-purifying systems, saving | ||
| (25) | millions of dollars worth of damage to property | |
| and to marine ecosystems. In Gretchen Daily’s | ||
| view, monetization, while unpopular with many | ||
| environmentalists, reflects the dominant role that | ||
| economic considerations play in human behavior, | ||
| (30) | and the expression of economic value in a common | |
| currency helps inform environmental decision-making | ||
| processes. |
题目：
According to the passage, Daily sees monetization as an indication of which of the following?
选项:
A、 has been dated to be 3.47 billion years old and thus is
B、has been dated at 3.47 billion years old and thus
C、have been dated to be 3.47 billion years old and thus are
D、have been dated as being 3.47 billion years old and thus
E、have been dated at 3.47 billion years old and thus are
答案:
A
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解答：
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解答：
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