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标题: 大全-18-10 [打印本页]

作者: kid    时间: 2004-3-16 21:09
标题: 大全-18-10



10.   urebred
cows native to Mongolia produce, on average, 400 liters of milk per year; if
Mongolian cattle are crossbred with European breeds, the crossbred cows can
produce, on average, 2,700 liters per year. An international agency plans to
increase the profitability of Mongolia’s dairy sector by encouraging widespread
crossbreeding of native Mongolian cattle with European breeds.



Which of the following, if true, casts the
most serious doubt on the viability of the agency’s plan?



(A) Not all
European breeds of cattle can be successfully bred with native Mongolian
cattle.



(B) Many young
Mongolians now regard cattle raising as a low-status occupation because it is
less lucrative than other endeavors open to them.



(C) Mongolia’s
terrain is suitable for grazing native herds but not for growing the fodder
needed to keep crossbred animals healthy.



(D) Cowhide and
leather products, not milk, make up the bulk of Mongolia’s animal product
exports to Europe.(C)


(E) Many European
breeds of cattle attain average milk production levels exceeding 2,700 liters.


答案是C,但大家不觉得E更加有理么?



作者: snow_mountain    时间: 2004-3-16 22:22
要反驳计划无用。C杂交的不合适当地生长。那要杂交有什么用呀。
作者: delldell    时间: 2004-3-16 22:28
这里强调的是MONGOLIA的产量, 所以欧洲牛产量的降低是无关因素, 不选E
作者: kid    时间: 2004-3-18 21:23
但题目说的是M和E牛杂交的话,能产2700

可是E说的是E牛自己就能产超过2700

说明杂交反而没有直接用E 好啊

请指教!


作者: snow_mountain    时间: 2004-3-18 22:41
以下是引用kid在2004-3-18 21:23:00的发言:
但题目说的是M和E牛杂交的话,能产2700
可是E说的是E牛自己就能产超过2700
说明杂交反而没有直接用E 好啊
请指教!

作用是对M而言的呀。要提高产量,所以要和高产的牛杂交。文章没说把E牛拉到蒙古去。所以E是无干项。
作者: kid    时间: 2004-3-19 09:20
~啊!~原来这样

to increase the profitability of Mongolia’s dairy sector

多谢bryony了!(请问你是什么花?)




作者: subhal    时间: 2005-1-2 06:52
c我理解,那么A呢?这个方法(杂交)未必能成功,不也是削弱吗?请指教!
作者: bigmouse    时间: 2005-1-2 18:52

前提已经说了,可以杂交成功。前提事实不可以被评价的!


请执教!!


作者: subhal    时间: 2005-1-10 06:32
明白了,3x!
作者: 笨笨可可    时间: 2008-6-13 06:19

A为什么不对?


作者: elfgoer    时间: 2008-9-4 00:39
(A)not all...是部分否定.部分肯定的寫法, crossbreeding有成功也有失敗的例子,所以沒有辦法完全否決掉crossbreeding的可行性

(E)many代表性不足,而且平均值的觀念是陷阱,有可能很多都低於2700 liters,只有少數幾頭牛產量偏高,才會造成平均值2700 liters的情況,所以說只靠少數幾頭牛的特例不能推論說每頭牛都可達到產量2700 liters的標準 






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