扫描二维码，直接登录
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.
因果。
因：tanker比operation更漏油。
果：为了保持用油 同时减少漏油，我们少用tanker。
削弱：为了保持用油 同时减少用油，我们不一定少用tanker。可能因本身有问题，也可能其他因素使得operation漏油比tanker多。
B，C方向反了。E 价格与目标无关。 D 和目标无关。 A 质疑了因。
登录 或 注册 后可以参加讨论