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  3. Rainforests are called the lungs of the planet, because they absorb carbon dioxide, greenhouse gas, and produce oxygen, which is

Rainforests are called the lungs of the planet, because they absorb carbon dioxide, greenhouse gas, and produce oxygen, which is

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问题     Rainforests are called the lungs of the planet, because they absorb carbon dioxide, greenhouse gas, and produce oxygen, which is【C1】______important to our well-being.【C2】______the fact that rainforests cover only 12 percent of the land-area of the Earth, they are home to【C3】______of the world’s plant and animal species, and for local populations they are a【C4】______source for food, fiber, fuel and medicines. Tropical forests【C5】______global and regional climate-systems, and【C6】______moisture into the atmosphere, which then returns to earth in the form of rain.
    【C7】______, where the land has been logged, there are no longer trees to produce the rain cycle which cools down the atmosphere, or to reduce carbon dioxide levels,【C8】______ to climate change. Because of tropical deforestation, animal and plant【C9】______is disappearing, and at least one species becomes【C10】______every day.
    Now that people are no longer【C11】______of the destructive lumbering of forest, the United States has partnered with the private sector, other governments and civil society organizations to form the Tropical Forest Alliance 2020(TFA 2020). The alliance aims to【C12】______ and coordinate actions by all partners to reduce tropical deforestation【C13】______ to key agricultural commodities such as palm oil, soy, beef, and paper. In support of TFA 2020, USAID【C14】______in early July that it will contribute $5.5 million to a separate but related public-private partnership with the World Resources Institute. With the help of this new tool, TFA 2020 partners will be able to more easily monitor tropical deforestation, and then quickly【C15】______ the information.
    The United States has consistently worked to【C16】______ the conservation of tropical forests by advancing【C17】______ and cooperative approaches, developing【C18】______ technical expertise and services, and【C19】______ leadership. With the new multi-national, public-private TFA 2020 partnership, we look forward to further increasing the【C20】______of our engagement.
【C4】
选项 A、fundamental
B、vital
C、basic
D、radical
答案B
解析 形容词辨析题。句意为：……对当地居民来说，热带雨林是他们衣食、燃料和药物的重要来源。这组词都有“基本的”的意思，其区别是：fundamental侧重指作为基础、根本的抽象的事物。例如：We shoulddirect out attention at the fundamental question．(我们应把注意力集中在这个基本问题上。)basic指明确、具体的基础或起点。例如：Drums are basic to African music．(鼓是非洲音乐的基本乐器。)radical着重指事物的根本或其来源。例如：The government is putting through some radical social reforms．(政府正在实行某些彻底的社会改革。)均不符合上下文语境，故排除。[B]vital是正式用词，侧重指维持生命、活力必不可少的，或生死攸关的，符合原文语境，故为答案。
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