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.
【C3】
选项 A、earth
B、population
C、evolution
D、extinction
答案D
解析 本题空格处是说被夷为平地的森林可以重新长出，污染的空气和水可以得到净化，但是生物灭绝却是永久的。因此这里应填extinction“灭绝”，这也可从前面提到的内容推出，因此D项正确。
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