2. 外语
  3. Rainforests are critically important to our well-being. Because they【B1】_____ carbon dioxide, a greenhouse gas, and produce oxyg

Rainforests are critically important to our well-being. Because they【B1】_____ carbon dioxide, a greenhouse gas, and produce oxyg

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问题     Rainforests are critically important to our well-being. Because they【B1】_____ carbon dioxide, a greenhouse gas, and produce oxygen. They are sometimes called the【B2】_____of the planet. Despite the fact that rainforests cover only 12 percent of the land-area of the Earth, they are home to between 50 and 90 percent of the world’s plant and animal species, and for local populations they are a【B3】_____source for food, fiber, fuel and medicines. Tropical forests regulate global and regional climate-systems, and release【B4】_____into the atmosphere, which then returns to earth in the form of rain.
    But where the land has been logged, there are no longer trees to produce the rain cycle which【B5】_____ the atmosphere, or to reduce carbon dioxide levels, contributing to climate change. Because of tropical deforestation, animal and plant habitat is【B6】_____, and at least one species dies out every day.
    Thus, the United States has partnered with the private sector, other governments and civil society organizations to form the Tropical Forest Alliance 2020, or TFA 2020. The alliance aims to mobilize and【B7】_____actions by all partners to reduce tropical deforestation related to key agricultural commodities such as palm oil, soy, beef, and paper and pulp.
    The United States has【B8】_____worked to promote the conservation of tropical foress by advancing innovative and cooperative development【B9】_____, diverse technical expertise and services, and diplomatic leadership. With the new multi-national, public-private TFA 2020 partnership, we【B10】_____ further increasing the breadth of our engagement.
【B5】
选项
答案cools down
解析 根据空格所在位置可知，空格处应填入动词(词组)作从句的谓语。结合录音可填入cools down，意为“降温”。拼写单词时应注意使用动词的第三人称单数形式。
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