38.
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.
答案是Ａ，想想也对～
不过我想问下Ｄ为什么不可以呢～？offshore peration对海洋表面造成的污染那个不是比较严重么．这样就削弱了啊～
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