[下载] 閱讀JJ+補充資料版~~~2008/05/12

junyue

15.澳大利亚盐化补充一点背景文章,转自一位CDer.

So where does the salt come from?

The sources of salt involved in dryland salinity are: rainfall (cyclic salt), rock weathering, aeolian deposits and ancient seas (connate salts).
                

Cyclic salts

Cyclic salts are those salts which are included in water evaporated from oceans and deposited over coastal areas. Rainwater generally contains 10 to 30mg/l of salts. Studies have shown that in Australia the rainfall input of salts is as great as 300kg/ha/yr near the coast, about 30kg/ha/yr 250km inland and about 15kg/ha/yr more than 600km inland.
                

Salts from rainfall only become a problem when there is not enough precipitation to flush the deposited salts from the soil profile via leaching. The salts will accumulate and if they are subsequently released then they will become an environmental issue.

Connate salts

Connate salt is salt incorporated in marine sediments at the time of deposition. The sediments were deposited by inland seas millions of years ago that naturally contained large quantities of salts. For example, the Wiannamatta Shale Group of the Sydney
                Basin were deposited by a retreating ocean (marine regression) during the Tertiary. These shales contain salt from seawater trapped during the time of deposition. These shales provide the salts responsible for salinity outbreaks in Western Sydney.

Continued weathering of rocks will release salts. This is generally not a source for large quantities of salt because large amounts of water are required for weathering reactions to occur. This means that if there is a continual flux of water salts will be flushed through the system rather than accumulating.

The Australian continent is geologically very old and so has had a long time for salts to naturally accumulate in the landscape. During this time the landscape has been affected by climatic oscillations (change) between glacial and interglacial conditions. During periods of aridity, winds were capable of blowing salt laden dust from western New South Wales to the east. One such period was the Pleistocene, when the climate was significantly more arid than today and strong easterly winds carried significant quantities of this salt laden Aeolian dust from the Murray
                Darling
                Basin and deposited it on the Southern Tablelands of New South Wales. It is the mobilisation of these salts incorporated in debris flows that is today the major source of salt for the dryland salinity occurrences on the Southern Tablelands.
            

wbly

楼主你是神啊！！

karenxie

补充引自：“永远都是美女”MM的JJ：

１．南美老鼠起源：
第一段：有人认为南美老鼠起源于北美洲，因为远古是大陆是连着的。
第二段：化石发现南美老鼠和非洲老鼠相似，都有5个crest，而北美老鼠有4个(有题,问南美老鼠来自非洲的证据．我选的是５个crest的那个选项，还有一个选项我认为是迷惑选项：最近发现的化石)， 所以南美老鼠应该是非洲过来的。
第三段：其实非洲老鼠到南美洲是有可能的。因为古时候两块大陆距离比较窄，飘洋过海要有2个星期。而老鼠可以通过休眠（我猜得）降低代谢率。（有题infer　什么样的老鼠在从非洲到美洲的途中最可能成活，我选的带有休眠的词的选项）
２．关于客户服务（不是很难但文章和选项都很长）:
第一段：manufactures的现状是使用robot和高科技生产高水平的产品．但是单纯的提高产量，降低费用仍然不能保证在竞争中的优胜地位．其实客户服务是尤为重要的．（一下那个servey的结果 undermine作者第一段的assertion，我选的是在消费者调查中人们关注质量，价格，而运送，安装等等并不影响购买决定．答案方向好把握，只是每个选项都很长）
第二段：早先的craft制造者，从设计到制造都要符合客户的要求，后期还要维修．（有题，问关于原来的制造商那个说法正确，我选的是带有customized的选项）而现在的生产厂商在upstream服务上基本上是没有的，生产大都是按照上层的规定模式来做．作者认为这样的管理模式是不好的．
第三段：对于downstream的服务，一直还是有的，但是还需要加强．哇，痛苦，想不起来了

junyue

１８篇多添一个版本．

2. 海底盐的一片。
P1. 在Mexico gulf发现海底盐的一些现象,..... One may well ask(highlight): 盐是solid..., 为什么会这样呢?因为固体(包括盐)在压力下可以流动
问题: One may well ask(原文可能不是这样)的作用是什么:有两个答案有些混淆，我想了半天，一个是中间有paradox, 一个是 question geographic phenomenon,我都忘了我选了那个，反正犹豫好久。
P2. 解释形成机制，基本思路是盐密度低而且不可压缩，往上浮，其他东西向下沉，形成naipir(拼写不准确)较长但简单，。.
P3. 解释这种现象的应用，尤其是在exploring oil.
P3是延伸性内容,文章总体是现象解释型,容易看懂。但题目问P3的作用，又有两个混淆选项，都有explain一词,好不容易看懂一片文章，选项却如此折磨人。

junyue

第30篇,focus group不是群面的意思，是专题小组的意思

junyue

这是２１篇的一个版本．

１．南美老鼠起源：
第一段：有人认为南美老鼠起源于北美洲，因为远古是大陆是连着的。
第二段：化石发现南美老鼠和非洲老鼠相似，都有5个crest，而北美老鼠有4个(有题,问南美老鼠来自非洲的证据．我选的是５个crest的那个选项，还有一个选项我认为是迷惑选项：最近发现的化石)， 所以南美老鼠应该是非洲过来的。
第三段：其实非洲老鼠到南美洲是有可能的。因为古时候两块大陆距离比较窄，飘洋过海要有2个星期。而老鼠可以通过休眠（我猜得）降低代谢率。（有题infer　什么样的老鼠在从非洲到美洲的途中最可能成活，我选的带有休眠的词的选项）

miankaiki

谢谢

fiona72669

好人！不能白看啊，我后天考完也来贡献一点~~

kkkarenn2001

考完一定會有所貢獻～大家一起加油吧！

LINGLING902

问下，我5。27考的话，看以上jj有用吗？还是要看上月的？谢谢了