老托福阅读真题PASSAGE 77-智课教育旗下智课教育.pdf

智 课 网 托 福 备 考 资 料 老托福阅读真题PASSAGE 77-智课教育旗下智课教育 本文和大家分享的是老托福阅读真题PASSAGE 77，练习真题是最 重要也最有效的复习方法，大家在复习托福阅读考试的时候一定要对真 题重视起来。 托福阅读 的思维方式就是托福阅读的出题方式，只有掌握了这种思 维方式，才有可能在做题之前，预测到新托福阅读题的出题形式和特点 ，为找答案节省时间。老托福阅读试题的核心价值，在于其最贴近真题 的阅读思维方式。此外老托福阅读真题比新托福IBT阅读文章要短，比 较容易适应。这也是大家在备考托福的时候非常重要 的一点。因为前期 的入手如果能从容易的开始，就会形成一个循序渐进的过程方式 ，让大家的练习有一个提高的过程。 既然老托福阅读试题有这样的效果，那我们如何利用那有限的真题 来达到锻炼自己的目的呢？事实上这就一个办法，就是坚持。本期为大 家推荐老托福阅读的真题PASSAGE 77，附有原文及答案，希望对托福考生备考有所帮助。 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species. The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time — a mass extinction. One of the best-known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died, mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a cha