单项选择题
A．exactly on the date of application B．at least 30 clays in advance C．any day between Tuesday and Saturday D．10 days before the date of the tour
A．they look like fare inspectors B．they don’t wear uniform C．they are polite to passengers D．they often take a back seat
A．on weekdays only B．five days a week C．every other day D．on weekends only