2.（ ）

(单选题)According to the passage, the writer seems to feel that ____ (单选题)It can be inferred from the passage that the writer’s opinio (单选题)According to the passage, the incidence of cancer is general (单选题)The best title for the passage is ______. (单选题)“There is money in fashion” means ______. (单选题)Today fashions change very quickly because _______. (单选题)From this passage we know that “fashion” means ______. (单选题)Why do teenagers go to sleep late according to Carskadon? (单选题)How many hours of sleep do 11-year-olds need every day? (单选题)What is the new National Sleep Foundation survey on?