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?
D------------A
(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.
D有些偏题了, The ocean floor.作者: hongyangyan 时间: 2010-6-17 06:45
D 没关啊，没有SPILL 就好。作者: zhengxing 时间: 2010-6-17 22:16
想问一下，原文不是说importing oil on tankers presently entails an even greater such risk per barrel of oil.而A选项说Tankers can easily be redesigned so that their use entails less risk of an oil spill.这不正好和原文矛盾吗，削弱是应该削弱他们的关系，总不能直接把原文给否了吧。
