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：
A passionate kiss shares much more than intimacy.
A single 10-second smooch can transfer tens of millions of bacteria from one partner to the other.
That’s the finding from a study in the journal Microbiome.
More than 700 different bacteria are estimated to live in the human mouth.
To find out how macking mixes microbes, Dutch scientists asked 21 couples to French kiss.
Intimate partners already have more of the same bacteria in their mouths than do unrelated individuals, because of the couple’s shared habits and environment.
But kissing really expedites the bacterial blending.
As part of the study, one member of the couple consumed a probiotic yogurt drink loaded with certain bacteria.
Saliva samples and tongue swabs revealed that after the couples puckered up, about 80 million bacteria from the drink moved mouth to mouth.
The salivary bug exchange was extensive but the work does not yet tell us why certain swapped bacteria either stuck around or were more transient.
Answering that question could help with future medical interventions aimed at microbes.
What the research did show: although the bacteria in saliva were easily altered, bacteria living on tongues tended to stay put.
Unlike certain frog-princes, those critters were less prone to change because of a mere kiss.
