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。
Gene Therapy Cures Color–Blind Monkeys
In a study in the journal Nature, researchers report that they have used gene therapy to cure a form of color–blindess in adult squirrel monkeys that lack a visual pigment. Karen Hopkin reports
Now, here’s something you don’t see every day: scientists cure color–blind monkeys. According to a report published online in the journal Nature, researchers have used gene therapy to allow color–blind squirrel monkeys to look at their fruit in a whole new light. [Scientific American is part of the Nature Publishing Group.]
In one type of squirrel monkey, the males lack a visual pigment called L–opsin. Its absence renders the monkeys color–blind, unable to distinguish reds and green. Most of the females, on the other hand, see in full color. So the scientists got to wondering: what would happen if they gave a boy squirrel monkey the same opsin that girls have.
Using a harmless virus, the scientists introduced the pigment gene into the eyes of color–blind adults. Lo and behold, about a month later, the monkeys with the new L–opsin gene were able to see hues they’d never seen before.
The research doesn’t mean we’ll soon be trying the same thing in humans. Because we’re not yet ready to monkey with our own selves that way. But the fact that a fellow primate was able to make and use the new pigments, even though they received the genes as adults, was a real eye–opener.