托福強(qiáng)化班入學(xué)測(cè)試卷(完整版)
【正文】 eren’t actually anything new. They 39。C (45176。常規(guī)班 托福強(qiáng)化班 入學(xué)測(cè)試卷姓名： 日期：測(cè)試說(shuō)明：216。F) can maintain a core temperature of over 25176。F). This warm body temperature may help not only the muscles to work better, but also the brain and the eyes. The billfishes have gone one step further. They have evolved special heaters of modified muscle tissue that warm the eyes and brain, maintaining peak performance of these critical organs. 2. Which of the following can be inferred from paragraph 2 about redwood forests?n They bee less stable as they mature.n They support many species when they reach climax.n They are found in temperate zones.n They have reduced diversity during midsuccessional stages.Paragraph 2: Even the kind of stability defined as simple lack of change is not always associated with maximum diversity. At least in temperate zones, maximum diversity is often found in midsuccessional stages, not in the climax munity. Once a redwood forest matures, for example, the kinds of species and the number of individuals growing on the forest floor are reduced. In general, diversity, by itself, does not ensure stability. Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability—just the opposite, in fact. A more plicated system is, in g
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