墨尔本PTE – 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。
Antioxidants–Diabetes Connection
In a study in the journal Cell Metabolism, some mice given antioxidants were more likely to become diabetic, because free radicals help muscle cells respond to insulin. Karen Hopkin reports.
You’ve no doubt heard of “free radicals”, those nasty chemicals that seem to contribute to heart disease, cancer and all sorts of human ailments. Maybe you even take antioxidant vitamins to help get rid of these unwanted toxins. Well, maybe you shouldn’t. Because a new study in the journal Cell Metabolism suggests that, when it comes to diabetes, free radicals can be good for you—and and antioxidants might make things worse.
Free radicals can damage vital cell components, and our bodies produce them naturally as we metabolize food. So, it stands to reason if we eat lots and lots of food, we’ll make tons of radicals. And put ourselves at risk of becoming seriously obese, and developing diabetes. All of which is bad.
But it’s actually not that simple. You see, in addition to being potentially harmful, free radicals are also necessary for cells to communicate. In particular, they help muscle cells respond to insulin. So, mice that can’t get rid of their free radicals actually do well on a high–fat diet, and it’s only when they’re given antioxidants that they get diabetes. If all that makes your head hurt, go for a nice walk. Because exercise is still good for you.
—Karen Hopkin
墨尔本PTE听力口语练习
