ACCORDING TO THE WRITER, ONE ENVIRONMENTAL PROBLEM IN THE WORLD TO...

46. - DE THI VAO THPT 50 CAU TRAC NGHIEM
DE THI VAO THPT 50 CAU TRAC NGHIEM
46. According to the writer, one environmental problem in the world today is ________ . A. acid rain B. industrial pollution. C. safe water shortage. D. population explosion .