In this section, you will hear one passage. At the end of the passage, you will hear four questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、They are killing you sweetly.
B、They are killing people in developing countries.
C、They are helping people to become healthier.
D、They are helping people in developed countries.