[em03]
(1)题是:
Photovaltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants , which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.
问假设.
我选C---None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
我觉得正是因为此技术不能移植到老工厂上才有原题的结论成立.
但答案是D--Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 10 times the cost of producing power at traditional plants.
我觉得这里提到的十倍的说法不能从原题的1/10中推出, 因为两者的比较对象不一致.
(2)题是:
The mind and the immune system have been shown to be intimately linked, and scientists are consistently finding that doing good deeds benefits one's immune system. The bone marrow and spleen, which produce the white blood cells needed to fight infection, are both connected by neural pathways to the brain. Recent research as shown that they activity of these white blood cells is stimulated by a result of magnanimous behavior.
问加强.
我选E----the number of white blood cells will increase radically if behavior is consistently magnanimous.
但答案是D---magnanimity is benificial to one's own interests.
就算E说的有点绝对,但D项中的"兴趣"不是更有点不沾边吗?
1.前提是the cost of producing electric power is one-tenth of what it was 20 years ago whereas the corresponding cost for traditional plants , which burn fossil fuels, has increased. 结论是photovoltaic power plants offer a less expensive ...
我们假设20年前,photovoltaic 的价格是p, traditional power的价格是t ,20年后各自对应的价格分别为p1,t1 根据题目可得p1=1/10 p ,p<10t, 推出p=10p1<10t, 则p1=10t,相当于给些选项加上一个not,结果却可以削弱题中的结论,所以这个选项是一个假设.
至于你有疑问的C选项,可以这样理解:photovoltaic 的技术是否可以应用到traditional plants并不直接可以推出对价格有什么影响. 要记住逻辑推理一定要充分利用题中所有信息做一个层次的推导,不要多层次地推导,也不要想当然地以为什么.作者: hopejie 时间: 2003-10-16 01:52
