单项选择题
A．a very great English novel B．an accurate portrayal of life in wartime C．an excellent piece of satire D．the work of a neglected author
A．is insignificant B．is enormous C．seems overestimated D．remains unknown
A．the Apollo mission was very successful B．protection from space radiation is no easy job C．astronauts will have deformed children of grandchildren D．radiation is not a threat to well protection space explorers