Gwd-5-21,可以帮忙解释一下吗？

ethyl

A：正确。取非，人均大米需求会马上显著下降，则有可能总需求量不变，因此不必进口大米

B：无关。取非，所有耕地都适合种大米，但前提是亩产量不会增加，所以对原论证无影响

C：无关。原因同B，前提是不能改的

D：继续无关。取非，有些地区人口会不增长，但前提是总人口要增长

E：lawyer说得很透彻，要不无关，因为其他的作物跟主题不相关；要不需要假设其他作物可以取代大米

tomato8306

  thanks
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scorpio0001,so clear

tomato8306

thank

eaststar

Q21:

In Teruvia, the quantity of rice produced per year is currently just large enough to satisfy domestic demand.  Teruvia’s total rice acreage will not be expanded in the foreseeable future, nor will rice yields per acre increase appreciably.  Teruvia’s population, however, will be increasing significantly for years to come.  Clearly, therefore, Teruvia will soon have to begin importing rice.

 

Which of the following is an assumption on which the argument depends?

 

1. No pronounced trend of decreasing per capita demand for rice is imminent in Teruvia.
2. Not all of the acreage in Teruvia currently planted with rice is well suited to the cultivation of rice.
3. None of the strains of rice grown in Teruvia are exceptionally high-yielding.
4. There are no populated regions in Teruvia in which the population will not increase.

There are no major crops other than rice for which domestic production and domestic demand are currently in balance in Teruvia

A: 如果人均大米消费下降，虽然人数上升，消费的大米总数量不一定上升，因此是weaken. not weaken is assumption.

B: 无关

C:原文已经说了总产量不会上升，一个地方产量的上升没有意义，无关

D: 原文已否定

E:原文说的是大米，跟其它作物没有关系，无关

numberunique

5 楼  appears to be plausible

[此贴子已经被作者于2006-6-16 19:01:59编辑过]

toapplezyj

思路：supply=demand,题中说supply:面积不变，单位面积产量不变，意思就是总supply不变；人口增加，推出结论：需要进口

如果还是供需平衡的话，则无须进口。要推出需要进口，必然是需求变大了

所以假设人均消费量不变的话，人口增加就能引起总demand增加。所以选A

elinaqu

这个帖子解释得真好。赞一个！

yangxuemei0111

Thanks !

mukti712

我怎么认为E项的错误主要在于时态啊，一般现在时。

题目关注的是将来的事情：Teruvia’s population, however, will be increasing significantly for years to come.  Clearly, therefore, Teruvia will soon have to begin importing rice.

如果E项也改成将来时的话，就是正确选项了。即将来rice不足的时候，可以用其他作物来平衡需求。

amorela

以下是引用mukti712在2007-11-8 10:04:00的发言：

我怎么认为E项的错误主要在于时态啊，一般现在时。

题目关注的是将来的事情：Teruvia’s population, however, will be increasing significantly for years to come.  Clearly, therefore, Teruvia will soon have to begin importing rice.

如果E项也改成将来时的话，就是正确选项了。即将来rice不足的时候，可以用其他作物来平衡需求。

是CR题啊,又不是SC........E就是一个无关选项啊.有没有其他的major crops不代表他们不吃米了,更不能说明不需要进口米.不要自己加上假设说"有了其他major crops,T国的人就不吃米了".