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，练习记笔记技巧和复述。
60秒科学节目（SSS）是科学美国人网站的一套广播栏目，英文名称：Scientific American – 60 Second Science,节目内容以科学报道为主，节目仅一分钟的时间，主要对当今的科学技术新发展作以简明、通俗的介绍，对于科学的发展如何影响人们的生活环境、健康状况及科学技术，提供了大量简明易懂的阐释。
This is Scientific American — 60-Second Science. I’mChristopher Intagliata.
We humans enjoy coffee and tea, to give our brainsa caffeine boost. And bees sometimes sip nectarthat naturally contains caffeine, which seems toenhance their memory. Now a study suggests thatbees enjoy another familiar drug produced by plants: nicotine.
“As it turns out, not just in humans, but even the bees seem to have difficulties quitting.” LarsChittka, a professor of behavioral and sensory ecology at Queen Mary University of London.
Chittka and his colleagues studied bumblebees as they visited fake flowers that containedvarying levels of nicotine. Unnaturally high nicotine concentrations deterred the bees. But atreal–world levels, the drug attracted bees. And they even learned a flower’s color faster, if thatflower offered a nicotine fix.
Sometimes bees paid a steep price for this preference. “They returned actually to flowers thathad previously sold them nicotine, so to speak, even if these flowers no longer containednectar.”
Which might give nicotine–pushing plants, like tobacco, an edge. “It provides these plantspecies with an unfair advantage over competing plants, because they can retain thefaithful services of pollinators, even if they’re offering suboptimal nectar in this case.”
The results are in the journal Scientific Reports.
And if caffeine and nicotine have these effects on bees? Perhaps natural floral pharmaciesstock other drugs too—that enhance pollination, and give bees a buzz.
Thanks for listening for Scientific American — 60-Second Science Science. I’m ChristopherIntagliata.