单项选择题
A．Because taxes increased. B．Because rents were too high. C．Because gangs came into their town. D．Because the violent crime among adults is rising.
A．the number of crimes done by young people B．the number of crimes done by adults C．the number of crimes done by school students D．the number of prisons
A．About one hundred and seventy thousand. B．About one hundred and seventy million. C．About one hundred and seventy billion. D．About one hundred and seventy.