文勇的新托福黄金&ccedil

structurehavenotchanged 113 mailliuwenyongcom

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Unformatted text preview: ion that “ (A fifteen­speed racing bicycle is more likely to break down than a child’s tricycle) ? ” ○To illustrate a general principle about the stability of systems by using an everyday example ○To demonstrate that an understanding of stability in ecosystems can be applied to help understand stability in 128 Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 other situations ○To make a comparison that supports the claim that, in general, stability increases with diversity ○To provide an example that contradicts mathematical models of ecosystems Paragraph 6: Ecologists are especially interested to know what factors contribute to the resilience of communities because climax communities all over the world are being severely damaged or destroyed by human activities. The destruction caused by the volcanic explosion of Mount St. Helens, in the northwestern United States, for example, pales in comparison to the destruction caused by humans. We need to know what aspects of a community are most important to the community’s resistance to destruction, as well as its recovery. 10. The word “pales” in the passage is closest in meaning to ○Increases proportionally ○Differs ○Loses significance ○Is common Paragraph 7 在 Many ecologists now think that the relative long­term stability of climax communities comes not from diversity but from the “patchiness” of the environment, an environment that varies from place to place supports more kinds of organisms than an environment that is uniform. A local population that goes extinct is quickly replaced by immigrants from an adjacent community. Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact. 11 在 Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incurred choices change the meaning in important ways or leave out essential information. ○Ecologists now think that the stability of an environment is a result of diversity rather than patchiness. ○Patchy environments that vary from place to place do not often have high species diversity. ○Uniform environments cannot be climax communities because they do not support as many types of organisms as patchy environments. ○A patchy environment is thought to increase stability because it is able to support a wide variety of organisms. 12在The word “adjacent” in the passage is closest in meaning to ○Foreign ○Stable ○Fluid ○Neighboring Paragraph 6: █Ecologists are especially interested to know what factors contribute to the resilience of communities because climax communities all over the world are being severely damaged or destroyed by human activities. █The destruction caused by the volcanic explosion of Mount St. Helens, in the northwestern United States, for example, pales in comparison to the destruction caused by humans. █We need to know what aspects of a community are most important to the comm...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.

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