WHICH OF THE FOLLOWING IS THE BEST TITLE FOR THE PASSAGE

46- - DE THI THU DAI HOC MON ANH VA DAP AN
Tiếng Anh DE THI THU DAI HOC MON ANH VA DAP AN
46- Which of the following is the best title for the passage?A- The eradication of smallpox. B- The World Health Organization.C- Infectious diseases. D- Smallpox vaccinations.