2. 外语
  3. A. approaches B. components C. comprise D. consist E. dramatically F. essential G. guarantee H. impacts I. methods

A. approaches B. components C. comprise D. consist E. dramatically F. essential G. guarantee H. impacts I. methods

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问题     A. approaches  B. components  C. comprise  D. consist  E. dramatically
    F. essential   G. guarantee   H. impacts   I. methods  J. modest
    K. mountainous L. prominently M. promise   N. urgent   O. yield
    Mountains cover about a quarter of the world’s land surface. They are critical【C1】________of the Earth’s surface and provide vital resources and 【C2】________ecosystems to a significant proportion of the global population. As the water towers of the world,【C3】________regions are important water suppliers for nearly half of all people. In addition to water, mountains also【C4】________timber and non-timber forest products, mineral resources, and many other food, fiber, and fuel products. Moreover, mountain ecosystems provide carbon storage, nutrient retention, a provision of clean oxygen, a destination for tourism and recreation and pest control. Therefore, mountainous regions【C5】________ecosystem security, and are key natural resource bases for human development due to their ecological, social, and economic values.
    Mountains are widely distributed across the continents, from tropical to arctic latitudes, and are defined as landforms that rise【C6】________above their surroundings, generally exhibiting steep slopes, a relatively confined summit area, and considerable local relief. Whilst there are three different【C7】________to mapping mountainous areas of the world, each with its own history and applications, it is clear that mountains 【C8】________a significant proportion of global land area.
    Due to the combined【C9】________of both an increasing human population and climate change, there is an【C10】________need to sustain mountain systems in order to support human well-being.
【C4】
选项
答案O
解析 动词辨析题。分析句子结构可知，空格前是名词mountains，空格后是名词timber，且空格所在句缺少谓语，因此，空格处应填入一个动词作句子的谓语。空格前一句提到山川的一个作用，即提供了重要资源和至关重要的生态系统。结合空格所在句前半部分提到的“除了提供水资源之外”可知，空格处也应表示山脉对地球的重要作用，故yield“出产，产生”为答案。
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