PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书（PLUS，Testbuilder, OG）之外就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。悉尼文波雅思PTE培训学校专门为澳洲，尤其是悉尼、墨尔本的PTE考生准备了适合PTE听力阅读练习的科学60秒。各位PTE同学可以练习PTE听力中的summarise spoken text和PTE口语中的retell lecture，PTE听力口语-科学60秒-Frosty Moss练习记笔记技巧和复述。废话少说，下面开始：
下面是墨尔本悉尼文波PTE雅思培训学校为大家整理的原文材料：
一项基于网络的实验表明，在人际关系错综复杂的人际网中，思想的传播深度和速度都比关系稀松的人际网高。
Diseases can spread quickly. Someone with a cold infects a few casual contacts, who in turn infect others. Ideas can also spread that way, along so–called random networks. But Damon Centola at MIT says that ideas and beliefs spread faster and more efficiently when they’re reinforced in clustered networks, with overlapping connections among the members.
Centola recruited more than 1,500 participants for what was billed as a Web–based health community. Each had an anonymous profile and was matched with health buddies. In one group, a minimal number of links connected the participants. The other group was denser, with redundant links.
In each group, a seed participant was planted with an idea: to register for an online health forum. Whenever a member registered, the member’s contacts got the message. Ultimately, 54 percent of the participants in the clustered network signed up, compared with only 38 percent in the random network. And the behavior spread about four times faster in the clustered groups. The study is in the journal Science. [http://bit.ly/96jPpc]
Centola thinks people are more swayed when they hear that multiple contacts are trying something new and that public health officials should take advantage of clustered networks to encourage people’s healthful behaviors.
—Cynthia Graber
墨尔本悉尼文波PTE雅思培训学校原创首发
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