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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.
【C5】
选项 A、adjust
B、regulate
C、modify
D、alter
答案B
解析 动词辨析题。句意为：热带雨林调节全球和区域性气候系统，将水分释放到大气中，然后以雨水的形式返回地球。本句的主语是热带雨林，根据常识可以推测，它对宾语全球和区域性气候系统可以起到调节的作用，因此[B]regulate“调节”为答案。adjust“调整，使……适合”；modify“修改，修饰”，指细小的变化，常含“缓和、降调”的意思，例如：We had to slightly modify the original design．(我们不得不对原来的设计稍加修改。)alter常指轻微的改变，强调基本上保持原物、原状的情况下所进行的部分改变，例如：Animals do not significantly alter their environments，but our minds both shape information and areshaped by it．(动物不会显著改变环境，但是我们的大脑在改变信息的同时也在被信息改变。)均不符合原文语境，故排除。
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