EXERCISE 3I. CHỌN TỪ/ CỤM TỪ THÍCH HỢP (ỨNG VỚI A, B, C, D) ĐỂ HÒAN TH...

44. According to the third paragraph, the World Health Organization ______.A. has not developed vaccines against malaria yet.B. doesn’t try to eradicate polio.C. is not concerned about polio.D. doesn’t carry out various health-related campaigns.