Exercise 3. Mark the letter A, B, c, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. GIẢI THÍCH CHI TIẾT GIÚP TỚ VS Ạ 11. Children often get vaccinated in order to be immune to fatal diseases. A. Susceptible B. vulnerable C. allowed D. resistant 12. This kind of fruit helps to boost the immune system. A. Decrease B. reduce C. increase D. maintain 13. Life expectancy for both men and women has improved greatly in the past twenty years. A. Living Standard B. Longevity C. Life skills D. Lifeline 14. Here are some principles for people to stick to if they want to stay healthy. A. Rules B. principals C. laws D. duties 15. We should consume healthy food and exercise regularly. A. Store B. purchase C. buy D. eat 16. There are several ways to exercise and stay healthy. A. Apply B. exploit C. keep fit D. operate