TOEFL Listening: ETS-TOEFL听力机经 - TLF7C791MP1M234QP$

What point does the professor emphasize when she discusses pipelines? A. Pipelines cannot be used to transport ethanol. B. Some countries already have extensive networks of ethanol pipelines. C. Pipelines formerly used for gasoline could be adapted for ethanol. D. The building of ethanol pipelines poses risks to the environment.