单项选择题
A．Entering the orbit and landing on the moon. B．Landing and walking on the moon surface. C．Exploration and researches into the moon composition. D．Exploration and construction of a moon base.
A．They will be launched separately. B．CEV will dock with the moon lander. C．They will be launched together. D．The moon lander will hold four astronauts.
A．It will base its design on that of the Apollo program. B．It will use parts only from the Apollo program. C．It will make use of the Apollo program and the space shuttle. D．It will develop new designs and make new components.