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  3. Purebred cows native to Mongolia produce, on average, 400 liters of milk per year, if Mongolian cattle are crossbred with Europe

Purebred cows native to Mongolia produce, on average, 400 liters of milk per year, if Mongolian cattle are crossbred with Europe

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问题 Purebred 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?
选项 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.
E、Many European breeds of cattle attain average milk production levels exceeding 2,700 liters.
答案C
解析 作为削弱计划可行性的题目，一般大多是反对为实施计划而采用的方法。若蒙古的自然条件不能得到杂交动物所需的饲料，如(C)所说，那么杂交牛在蒙古便不能生存，自然也就不能实现所提计划。段落推理井未说到“all”，因此(A)不可能起到反对作用；(E)易误选，但段落里面并未说出杂交牛最好，而且本题是让我们质疑计划的可行性，所以(E)不正确。
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