单项选择题
A．call your neighbor B．practice several times C．teach children how to use the telephone D．have children memorize some simple facts
A．would be little better than the fourth level B．may be a lot more desirable than the first four C．can be the last and most satisfying level D．will become attainable before the government takes actions
A．The Cherokee Indians. B．Tourists. C．Ben Sands. D．Scientists.