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题库 / Prep2007E2-CR-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?
Tankers can easily be redesigned so that their use entails less risk of an oil spill.
Oil spills caused by tankers have generally been more serious than those caused by offshore operations.
The impact of offshore operations on the environment can be controlled by careful management.
Offshore operations usually damage the ocean floor, but tankers rarely cause such damage.
Importing oil on tankers is currently less expensive than drilling for it offshore.
D：海上开采会破坏海床但是tanker不会--看似一个方案的副作用，其实是无关选项，文章说的是为了降低风险，{所以}。。weaken的方向应该是--此方案不能降低风险
A：tanker--redesign--降低风险--说明tanker更好（这个不算反前提，因为前提中有个小词--【presently】 tanker risk higher--暗示可以change的 ）
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