Offshore oil-drilling operations entail an unavoidable risk of an oil spill, but importing oil on tankers presently entails an even greater such risk per barrel of oil. Therefore, if we are to reduce the risk of an oil spill without curtailing our use of oil, we must invest more in offshore operations and import less oil on tankers.
Which of the following, if true, most seriously weakens the argument above?
186. Offshore oil-drilling operations entail an unavoidable risk of an oil spill, but importing oil on tankers presently entails an even greater such risk per barrel of oil. Therefore, if we are to reduce the risk of an oil spill without curtailing our use of oil, we must invest more in offshore operations and import less oil on tankers. Which of the following, if true, most seriously weakens the argument above? (A) Tankers can easily be redesigned so that their use entails less risk of an oil spill. (B) Oil spills caused by tankers have generally been more serious than those caused by offshore operations. (C) The impact of offshore operations on the environment can be controlled by careful management. (D) Offshore operations usually damage the ocean floor, but tankers rarely cause such damage. (E) Importing oil on tankers is currently less expensive than drilling for it offshore. 187.
我觉得这道题用词用得那叫一个精辟: 186. Offshore oil-drilling operations entail an unavoidable(表明通过什么方法都不能避免)risk of an oil spill, but importing oil on tankers presently(表明通过某某方法在未来是可以避免的,正如A)entails an even greater such risk per barrel of oil. Therefore, if we are to reduce the risk of an oil spill without curtailing our use of oil, we must invest more in offshore operations and import less oil on tankers. Which of the following, if true, most seriously weakens the argument above? (A) Tankers can easily be redesigned so that their use entails less risk of an oil spill. (B) Oil spills caused by tankers have generally been more serious than those caused by offshore operations. (C) The impact of offshore operations on the environment can be controlled by careful management. (D) Offshore operations usually damage the ocean floor, but tankers rarely cause such damage. (E) Importing oil on tankers is currently less expensive than drilling for it offshore.
以下是引用jandj_shanghai在2003-11-27 8:04:00的发言: D irrelevant damage the ocean floor和risk of oil spill没有关系。 题目要求是if we are to reduce the risk of an oil spill
文中说reduce the risk of an oil spill,我们必须more offshore, less tankers因为tanker的risk比offshore大。 A选项说redesign tanker可以减少risk,则通过redesign也可以reduce risk,不是must more offshore less tankers。