单项选择题A．The AIDS virus may stay in the human body for some time before it develops into the disease.B．AIDS makes most of the productive citizens lose their power to work.C．Many people are free from the fear of AIDS.D．Those who are infected with AIDS should not spread disease to other people.

单项选择题A．It sticks to the bacteria.B．It drags the tooth.C．It brushes the gum line.D．It loosens the tartar.