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101. Which of the following most logically completes theargument? The irradiation of food kills bacteria and thusretards spoilage. However,it also lowers the nutritional value of many foods. For example, irradiationdestroys a significant percentage of whatever vitamin B1 a food may contain. Proponents of irradiation pointout that irradiation is no worse in this respect than cooking. However, this fact iseither beside the point, sincemuch irradiated food is eaten raw, or else misleading, since
(A) many of the proponents of irradiation are fooddistributors who gain from foods’ having a longer shelf life (B) it is clear that killing bacteria that may be presenton food is not the only effect that irradiation has (C) cooking is usually the final step in preparing foodfor consumption, whereas irradiation serves to ensure a longer shelf life forperishable foods (D) certain kinds of cooking are, in fact, even moredestructive of vitamin B1 than carefully controlled irradiation is (E) for food that is both irradiated andcooked, the reduction of vitamin B1 associated with either process individuallyis compounded 思路：
Proponents of irradiation point out that irradiation is no worse in this respect than cooking
支持者观点：认为I不会比C更差，即I<=C
However, 转折，证明I>C，即I比C的破坏大
第一个条件：生的条件下 this fact is either beside the point, since much irradiated food is eaten raw
因为C是烹饪，而生食物是不需要烹饪的，所以I>C
第二个条件：（按第一个条件推测是熟食） or else misleading, since
那么看哪项是说I>C的
A，在说经销商，无关
B，在说I的作用，无影响
C，在说I和C的用途，无关
D，C比I破坏大，C>I,而题目需要的是I>C,作用相反
E， 即I又C造成双倍破坏，即I+C的情况造成双倍破坏，(设破坏值为X，那么I+C=2X)
解析：E项在说的就是熟食情况。可以想象C+C=X（因为由生食C烹饪到熟食造成X，再C烹饪也只是熟食为0）。而I+C (生食先C，造成了X，而后再I，又造成了X,总为2X)。所以同是熟食的情况下，C为0，而I=X，所以I>C。
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发表于 2013-12-12 11:28:53
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