2. 外语
  3. Looking at the basic biological systems, the world is not doing very well. Yet economic indicators show the world is【B1】______.

Looking at the basic biological systems, the world is not doing very well. Yet economic indicators show the world is【B1】______.

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问题     Looking at the basic biological systems, the world is not doing very well. Yet economic indicators show the world is【B1】______. Despite a slow start at the beginning of the eighties, global economic output increased by more than a fifth during the【B2】______. The economy grew, trade increased, and millions of new jobs were created. How can biological indicators show the【B3】______of economic indicators?
    The answer is that the economic indicators have a basic fault: they show no difference between resource uses that【B4】______progress and those uses that will hurt it. The main measure of economic progress is the gross national product(GNP).【B5】______, this totals the value of all goods and services produced and subtracts loss in value of factories and equipment. Developed a half-century ago, GNP helped【B6】______a common way among countries of measuring change in economic output. For some time, this seemed to work【B7】______well, but serious weaknesses are now appearing. As indicated earlier, GNP includes loss in value of factories and equipment, but it does not【B8】______the loss of natural resources, including nonrenewable resources such as oil or renewable resources such as forests.
    This basic fault can produce a【B9】______sense of national economic health. According to GNP, for example, countries that overcut forests actually do better than those that preserve their forests. The trees cut down are counted as income but no subtraction is made for【B10】______the forests.
【B4】
选项
答案sustain
解析 此处应该填入动词原形作从句谓语，上文的先行词resource uses充当其主语。sustain意为“保持，维持”。
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