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：
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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’m Jason Goldman.
The little brown bat was once abundant in the eastern U.S. But within the last 15 years, a fungus called Pseudogymnoascus destructans infiltrated a cave in upstate New York. This fungus causes what’s called white-nose syndrome in bats.
The illness has now spread throughout North America, causing widespread bat die-offs. But recently, little brown bats in New York have stopped declining. In fact, their numbers are actually going back up.
“That was exciting, but we had no idea how these bats were persisting with the disease.” Harvard University epidemiologist Kate Langwig.
“Little brown bats, during the fall swarm around hibernacula entrances. During that time period they’re active, and they’re feeding and fattening for winter, they also mate during that time period. Then they go into hibernation, and that’s really when infection peaks. Winter is the time period in which white nose syndrome is happening to bats.”
To understand how the New York bats were surviving, Langwig and her team compared them to bats from Illinois and Virginia, in colonies that are still experiencing the initial mass die-offs. They wanted to see whether the New York bats had simply found a way to tolerate the presence of the pathogen, or whether they’d actually developed resistance to the infection.
“So we found that when bats first return to hibernacula, they still become infected. Both in areas where the fungus has recently invaded as well as in areas where the fungus is established, bats become infected at the same time. And then in both places we see the fungus begin to grow and start to increase. However in areas where the disease has been for a number of years, what we find is that the fungus then reaches kind of a plateau.”
So in New York, the disease ramps up starting in the early winter but then the fungus stops spreading. In Illinois and Virginia, it just keeps on growing.
“It suggests that the bats are somehow actually limiting the growth of the fungus on their skin.”
Langwig still doesn’t know how the bats are fighting off the disease. She also wants to find out why their resistance doesn’t show up until so late in the winter. Does the response wait until it hits some threshold? Do the bats’ immune systems just take longer to boot up during hibernation?
And last, of course, she wants to know what lessons bat researchers can learn from this population that might help them save other types of bats in other places.
“These results, that little brown bats have developed resistance, are really encouraging to think about. We could see bats abundant once again in the Northeast.”
Thanks for listening for Scientific American — 60-Second Science Science. I’m Jason Goldman.
