2. 外语
  3. There have been five extinction waves in the planet’s history—including the Permian extinction 250 million years ago,【C1】______a

There have been five extinction waves in the planet’s history—including the Permian extinction 250 million years ago,【C1】______a

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问题     There have been five extinction waves in the planet’s history—including the Permian extinction 250 million years ago,【C1】______an estimated 70% of all land animals and 96% of all marine creatures vanished. The sample polling of animal populations so far suggests that we may have entered【C2】______will be the planet’s sixth great extinction wave.
    Forests razed can grow back, polluted air and water can be cleaned—but【C3】______is forever. And we’re not talking about losing just a few species. In fact, conservationists quietly【C4】______that we’ve entered an age of triage(治疗类选法), when we might have to decide which species can truly be【C5】______. The worst-case scenarios of habitat【C6】______and climate change—and that’s the pathway we seem to be【C7】______—show the planet losing hundreds of thousands to millions of species, 【C8】______of which we haven’t even discovered yet.
    So【C9】______you care about tigers and elephants, rhinos and orangutans, then you should be scared. But【C10】______shouldn’t leave us paralyzed. In hot spots like Madagascar and Brazil, conservationists are working with locals on the ground, 【C11】______that the protection of endangered species is tied to the welfare of the people who live closest to them. A strategy known as avoided deforestation goes【C12】______, encouraging environmental protection【C13】______putting a price on the carbon locked in rain forests and allowing countries to trade credits in an international market, 【C14】______that the carbon stays in the forest and is not cut or burned. It’s【C15】______that any of this will stop the sixth extinction wave, let alone preserve the biodiversity we still enjoy, but we have no choice but to try.
【C14】
选项 A、considering
B、indicating
C、supposed
D、provided
答案D
解析 本题空格处是说如果森林没有被砍伐或烧毁，其中的碳资源仍然存在，那么就可以通过给热带雨林地区的碳资源标价来鼓励环境保护。根据空格处前后的内容可以推知，所填词引导的是条件状语从句，因此应填provided“如果，只有……才”，D项正确。
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