单项选择题
A．He happened to fly over it. B．He remembered it himself. C．He made a guess and happened to be right. D．He figured it out with the help of some simple instruments.
55（）A．inB．onC．withD．from
单项选择题55（）
A．in B．on C．with D．from
54（）A．meansB．meaningC．meantD．to mean
单项选择题54（）
A．means B．meaning C．meant D．to mean
52（）A．register nameB．advertisementC．business philosophy...
单项选择题52（）
A．register name B．advertisement C．business philosophy D．organization form
