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.
【C10】
选项
答案N
解析 形容词辨析题。分析句子结构可知，空格所在句是一个完整的there be结构，因此，空格处应填入一个形容词修饰名词need。又因为空格前的不定冠词为an，故该形容词应为元音音素开头。结合上下文可知，此处是说山区资源受到了人口增长和环境变化的影响，人类应该采取行动保护山区生态系统。因此，空格处所填词应该能表达出这一行动的“紧迫性”，故urgent为答案。
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