2. 外语
  3. Extinction is difficult concept to grasp. It is an【B1】______concept. It’s not at all like the killing of individual lifeforms th

Extinction is difficult concept to grasp. It is an【B1】______concept. It’s not at all like the killing of individual lifeforms th

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问题     Extinction is difficult concept to grasp. It is an【B1】______concept. It’s not at all like the killing of individual lifeforms that can be renewed through normal processes of reproduction. Nor is it simply【B2】______numbers. Nor is it damage that can somehow be remedied or for which some substitute can be found. Nor is it something that simply affects our own generation. Nor is it something that could be remedied by some supernatural power. It is rather an【B3】______and final act for which there is no remedy on earth or in heaven. A species once extinct is gone forever. However many generations【B4】______us in coming centuries, none of them will ever see this species that we extinguish.
    Not only are we bringing about the extinction of life【B5】______, we are also making the land and the air and the sea so toxic that the very conditions of life are being destroyed.【B6】______basic natural resources, not only are the nonrenewable resources being【B7】______in a frenzy(疯狂)of processing, consuming, and【B8】______, but we are also ruining much of our renewable resources, such as the very soil itself on which terrestrial(地球上的)life depends.
    The change that is taking place on the earth and in our minds is one of the greatest changes ever to take place in human affairs, perhaps the greatest, since what we are talking about is not simply another historical change or cultural【B9】______, but a change of geological and biological as well as psychological order of【B10】______.
【B5】
选项
答案on a vast scale
解析 空格所在句不缺少句子主要成分，因此，应填入副词或副词短语，充当句子的状语。上一段提到了灭绝，本段提到了人类对自然资源的浪费和破坏，这些都是大范围的行为。on a vast scale意为“大面积的，大范围的”。
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