单项选择题
A．is very confused about the origin of the Earth B．might possibly reach life outside the C．believes it is possible to step off the Earth D．is historically incapable of exploring the universe
A．forcefully and complexly B．elaborately and literally C．simply and humorously D．snobbishly and cleverly
A．One of the major tasks of education is to discover the most promising students. B．In order to teach effectively, educators are requested to lay emphasis on one particular field. C．Some subjects have been over-emphasized in public schools. D．The progress of the society cannot merely rely on inventors.