TOEFL Listening: TPO-TOEFL阅读TPO - 3HGQNP469208847WN$

In paragraph 6, the author's primary purpose is to A. provide examples of how oil exploration can endanger the environment B. describe accidents that have occurred when oil activities were in progress C. give an analysis of the effects of oil spills on the environment D. explain how technology and legislation help reduce oil spills