单项选择题
A．an underground testing site B．an Indian meeting ground C．a tourist attraction D．a motor boat race course
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