单项选择题A.Because they have had little exposure to high level of sounds.B.Because they suffer from hearing loss.C.Because they don’t know how to operate stereo systems.D.Because they are not qualified engineers.
单项选择题A.Because many people don’t know how to behave in social situations.B.Because most people are shy by nature.C.Nobody will laugh at you for being shy.D.Shyness is difficult to overcome.