2. 职称英语
  3. There have been five extinction waves in the planet’s history—including the

There have been five extinction waves in the planet’s history—including the

游客2025-04-19  47
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. [br] 【C2】
选项 A、that
B、what
C、when
D、which
答案 B
解析 本题空格处是说动物种群的样本调查显示，我们可能已经步人地球第六次物种灭绝。空格处的词用于引导宾语从句，并且在从句中可作主语。that也可引导宾语从句，但是that在从句中不作句子成分。因此这里应填what，B项正确。
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