19. in which of the following sentences is the word down used as an adverb?

a. just as she was standing to give her presentation, ashlee fell down. b. the ball moved down the street towards the intersection. c. ricky rolled down the car window to place his order at the coffee shop. d. gail fell down the steps because she tripped on her untied shoelace.

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious