老托福阅读真题passage 86-智课教育旗下智课教育.pdfVIP

智 课 网 托 福 备 考 资 料 老托福阅读真题PASSAGE 86-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 86，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 86，附有原文及答案，希望对托福考生备考有所帮助。 The smooth operation of an ant colony depends on ten to twenty different signals, most of which are pheromones (chemical signals triggering behavioral responses). It is estimated that red fire ants employ at least twelve different chemical signals. The simplest of these is the carbon dioxide from the respiration of an ant cluster, a chemical that acts as a pheromone to promote aggregation. Workers move toward a source of carbon dioxide, resulting in solitary ants moving to join a group. At the other extreme, the most complex of the fire ants signals is probably colony odor, by which the workers of a particular colony or nest identify another worker as local or foreign. Each ant nest has its own odor as a result of its location, history, and local food supply. The resident ants pick up this odor on their bodies, so that ants of the same species, but from different nests, have different colony odors. This allows ants to identify intruders and maintain colony integrity. Fire ants also make use of an alarm pheromone to alert workers to an emergency, and their scouts lay down a trail pheromone as a guide during mass migrations. A fire ant queen emits a chemical signal that identifies her to the colonys workers. They respond by scurrying to gather around her. The decomposing corpse of a dead ant also generates a signal, to which workers respond by eliminating the corpse from the nest. Ants provide examples of both public (accessible to other species) and private messages. One of their most important private messages c