求雅思阅读文章出处！高分悬赏！！！

PASSAGE 2
A I have recently planted a hedge. Living in a rural environment, I made the decision to plant only native species, including field maple, hawthorn, hazel, dog-rose and blackthorn. In time this will grow to form a dense hedge whose primary purpose is to form a windbreak, but which will also be attractive both to me and to wildlife. In the two years since planting, a number of hedgerow wild flowers, such as scabious and knapweed have already begun to colonize the spaces between the growing shrubs. Of course, if allowed to grow too freely, rank weeds and grasses will limit the growth of the hedge and need to be removed. This is done by hand, without the use of herbicides, in order to encourage bio-diversity.

B But it is not only native species that have found a foothold in the new growing environment. A number of garden plants of non-native origin have also established themselves. Some have come via wind-blown seeds, some through bird droppings, while others have arrived through human agency, stuck to the soles of boots or as dormant seeds embedded in garden compost. They include Lychnis coronaria, Echinops ritro and Brunnera macrophylla, all valued garden plants, but looking rather out of place in a natural setting. Such intruders are called ‘garden escapes’, and it isn’t only my garden they are escaping from.

C In his recently published book, Flora Britannica (1998), Richard Mabey devotes a whole chapter to garden escapes. Many of these are relatively recent introductions, such as the Indian balsam which was first brought to Britain from the Himalayas in 1829, and Fuchsia magellanica which arrived about the same time. Both of these grow wild in Britain now; Indian balsam may be found along riversides and in damp places all over Britain, while Fuchsia magellanica is mostly confined to mild south-west England. Buddleja davidii was introduced from its native China in the 1890s and is now a ubiquitous shrubby weed of urban wasteland, derelict building sites or crumbling walls. Its dusky purple flowers are much frequented by butterflies and for this reason it is by no means an unwelcome interloper. Like the others it has succeeded by exploiting an ecological niche. No native British plant species has been able to colonize dry inhospitable urban landscapes to such advantage.

D Other vigorous aliens introduced as garden plants are now regarded as pernicious weeds. One such is Japanese knotweed, probably introduced into Victorian gardens in the 1840s. Its root system extends rapidly and it is able to regenerate from the smallest fragment of root. It forms dense thickets reaching 1.5 metres。。。。。。。。。。字数超限，这能附上这么多，求高人解答！！

在雅思阅读的学习过程中，学生经常问到，“剑一至剑六都做了好几遍了，文章都非常熟了，还有其他的阅读材料可以使用吗？应该读什么样的材料呢？”针对这个问题，我带领大家探究一下A类雅思阅读文章的来源，并为大家提供一些推荐的阅读材料。

　　首先，细心的同学已经发现从剑四开始每本书的后面都多了一个acknowledgements。其实在acknowledgements里面已经给出了剑桥这几本材料里面阅读文章的来源。经过总结归纳不难发现，雅思A类文章主要来自于学术出版物，而非一般娱乐性出版物。其中主要用到的学术杂志如下：

　　1.New Scientist 这本杂志被用到的频率最高，如剑四中的Lost for Words, Play is a Serious Business，剑五中的What’s So Funny?, Flawed Beauty: the Problem with Toughened Glass，和剑六中的多篇文章 Australia’s Sporting Success, Climate Change and the Inuit, Graying Population Stays in the Pink, Do Literate Women Make Better Mothers?

　　2.The Economist 列居其次，如剑五中的The Truth about the Environment, 剑六中的Delivering the Goods

　　3.还有American Scientist和Scientific American这两个主要的美国学术期刊，例如剑五的Disappearing Delta和剑六的The Search for Anti-aging Pills

　　4.当然还有National Geographic。但是值得注意的是，因为这是休闲杂志，所以只作为了G类的阅读，如剑六中的Pterosaurs

　　除了以上提到的若干来源之外，雅思A类的阅读文章还出自Nature, Discover, Time (Europe), Boston Global, History Today等其余期刊或杂志。至于是哪次考试的哪篇文章，由于敏感原因在这里就不在透露。

　　了解这些雅思文章出处之后对于广大考生平时进行泛读训练具有很好的指导作用。考生甚至可以使用阅读机经，从以上杂志期:刊的官方网站上搜索到相关背景文章进行有针对性的阅读训练。

　　特别说明：由于各方面情况的变化与调整，新东方雅思网所提供的所有考试信息仅供参考，敬请考生以权威部门公布的正式信息为准。

雅思文章范围很广的，出自 国家地理杂志，一些科技文摘 不过你要读就要读比较地道的，不要买中国人编的，那样的话不会有太大提高。 我觉得 discovery 也不错， 老外好多都看这个