随着PTE考生对PTE口语和PTE听力的重视，大家口语和听力的分数得到极大提高，但是PTE阅读渐渐成为考生们新的难题。墨尔本悉尼文波PTE特别为PTE考生们挑选了适合练习PTE阅读的文章，主题，内容，长度都与PTE阅读题中的文章相似。激活学过的词汇，更新新的词汇，提高阅读速度，全面提升自己的阅读能力。
In science it is good to have a hypothesis to frame one’s thinking. The term “chemical imbalance” is just such a thing. It is a layman’s simplification of the monoamine hypothesis, which has been the prevalent explanation for depression for almost 50 years. Monoamines are a class of chemical that often act as messenger molecules (known technically as neurotransmitters) between nerve cells in the brain. Many antidepressive drugs boost the level of one or other of these chemicals. In the case of Prozac, the monoamine in question is serotonin.
The monoamine hypothesis, though, is under attack. One long-standing objection is that, although drugs such as Prozac raise levels of their target monoamine quite quickly, the symptoms of depression may take weeks, or even months to abate—if, indeed, they do abate, for many patients do not respond to such drugs at all. Now, to add to that, a second objection has emerged. This is the discovery that ketamine, a drug long used as an anaesthetic and which is also popular recreationally, works, too, as a fast-acting antidepressant. Ketamine’s mode of action is not primarily on monoamines, so the race is on to use what knowledge there is of the way it does work to design a new class of antidepressant. This is a change of direction so radical that some think it heralds a revolution in psychiatry.
monoamine： n. 一元胺
neurotransmitters： n. 神经传递素
serotonin： n. <生>血清素
abate： vt. 减少, 减轻
ketamine： n. 克他命(一种高效麻醉剂)
anaesthetic： n. (使局部或全身失去知觉的)麻醉剂,麻醉药 adj. 麻木的；麻醉的
herald： n. 使者, 预报者 vi. 预示
psychiatry： n. 精神病学;精神病治疗
