MANY SOURCES OF WATER ARE NOT DRINKABLE BECAUSE OF _______ . A. AC...

47. - DE THI VAO THPT 50 CAU TRAC NGHIEM
DE THI VAO THPT 50 CAU TRAC NGHIEM
47. Many sources of water are not drinkable because of _______ . A. acid rain. B. industrial pollution. C. garbage D. all A, B, C, are correct