单项选择题
A．They are used to express feelings only. B．They can not be written down. C．They are simply sounds. D．They are mysterious.
A．they could agree upon certain signs B．they could write them down C．they could communicate with each other D．they could combine them
A．The more we read and learn, the more ignorant we are. B．The more we read and learn, the more confused we are. C．The more we read and learn, the more learned we are. D．The more we read and learn, the more snobbish we become.