请问一道GWD的CR

渐迷离

GWD1-Q14:

That the application of new technology can increase the productivity of existing coal mines is demonstrated by the case of Tribnia’s coal industry.  Coal output per miner in Tribnia is double what it was five years ago, even though no new mines have opened.

 

Which of the following can be properly concluded from the statement about coal output per miner in the passage?

 

1. If the number of miners working in Tribnian coal mines has remained constant in the past five years, Tribnia’s total coal production has doubled in that period of time.

2. Any individual Tribnian coal mine that achieved an increase in overall output in the past five years has also experienced an increase in output per miner.

3. If any new coal mines had opened in Tribnia in the past five years, then the increase in output per miner would have been even greater than it actually was.

4. If any individual Tribnian coal mine has not increased its output per miner in the past five years, then that mine’s overall output has declined or remained constant.
5. In Tribnia the cost of producing a given quantity of coal has declined over the past five years.

为什么选A呀,产量增加和矿工人数有关?

为什么选A呀,产量增加和矿工人数有关?

oldwen

我试着回答.

总产量=单井人均产量*人数*矿井数

题干已知Coal output per miner 即单井人均产量double了;no new mines have opened即矿井数不变;

A说,如果矿工人数不变,则总产量也double.

GMAT的CR里很有这样的简单公式题,绝大多数是本题一样的

总量=数量*每单位量(包括速度,生产率,消费率,利率等等)

渐迷离

还是有点不明白.A是说如果在过去的五年里人数不变,产量会在那段时间DOUBLE,可是人均产量在过去的五年里还没有DOUBLE啊,是运用新技术才提高生产率的吧.

hattiezhang

Coal output per miner in Tribnia is double what it was five years ago

这不是double了吗？

dianecarton

以下是引用渐迷离在2008-3-4 23:23:00的发言：
还是有点不明白.A是说如果在过去的五年里人数不变,产量会在那段时间DOUBLE,可是人均产量在过去的五年里还没有DOUBLE啊,是运用新技术才提高生产率的吧.

新技术运用是题目已知条件。output per miner double 了，miner数不变，所以total coal production doubled 。如果还绕不过来，可以假设工人数少一半，那即使output per miner double了，total production还是不变的。

GavinDing

以下是引用渐迷离在2008-3-4 23:23:00的发言：
还是有点不明白.A是说如果在过去的五年里人数不变,产量会在那段时间DOUBLE,可是人均产量在过去的五年里还没有DOUBLE啊,是运用新技术才提高生产率的吧.

 

 

这是结论题 从上面的原文推到下面

原文说新科技的采用让每个矿工的产量增加两倍了

★所以每个矿工的产量是2倍

↓

所以他的结论是
    

*如果矿工人数不变 ★“总”产量是两倍

还有下列考法：

如果矿工人数减半
                    总产量维持不变

矿工人数两倍
                    总产量是四倍

 

还有下列考法：

如果矿工人数减半
            总产量维持不变

矿工人数两倍
            总产量是四倍

 

不知道这样说你是否了解

[此贴子已经被作者于2008-3-5 0:11:42编辑过]

渐迷离

人均产量*人数=总产量,这个我知道.我不明白的是Coal output per miner in Tribnia
            is double what it was five years ago 是说现在的人均产量比五年前DOUBLE,可A说的是五年前的事,那时还没有新技术,人均产量没有翻倍.

渐迷离

A是说什么时候产量会翻倍啊?用的是现在完成时,是指到现在翻倍吧,不是指五年前翻倍,可能是in
    that period of time让我误认为A是指五年前人均产量翻倍,人数不变,然后总产量翻倍,所以我奇怪那时人均产量并没有变化. 恩,我知道了,应该是这里理解上出了问题.