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help...新东方2道题目求解
14. Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade. However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.
Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability? (A) The cost of oil has fallen dramatically. (B) The reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment. (C) Technological changes have increased the efficiency of oil-fired power plants. (D) Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants. (E) When the price of oil increases, reserves of oil not previously worth exploiting become economically viable. 这题目到底什么意思?我觉得我要饶里面了 哪位大虾指点以下迷津? 万分感谢
8. Residents of an apartment complex are considering two possible plans for collecting recyclable trash. Plan 1-Residents will deposit recyclable trash in municipal dumpsters located in the parking lot. The trash will be collected on the first and the fifteenth days of each month.
Plan 2-Residents will be given individual containers for recyclable trash. The containers will be placed at the curb twice a week for trash collection.
Which of the following points raised at a meeting of the residents, if valid, would most favor one of the recycling plans over the other? (A) Residents will be required to exercise care in separating recyclable trash from nonrecy- clable trash. (B) For trash recycling to be successful, residents must separate recyclable bottles and cans from recyclable paper products. (C) Penalties will be levied against residents who fail to sort their trash correctly. (D) Individual recycling containers will need to be made of a strong and durable material. (E) Recyclable trash that is allowed to accumulate for two weeks will attract rodents.
C为什么不对?因为方案2需要居民自己放垃圾进自己的垃圾厢,所以很容易发现谁分类错了。这应该也是他们不喜欢这个方案的原因啊
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