12.The fact that it will never be possible to converse with someone on another planet shows that________
［A］ radio messages do not travel fast enough
［B］ no object can ever travel faster than light
［C］ western culture has a special idea of communication
［D］ certain universal laws cannot be prevailed against
13.Confronted with the new order of cosmic reality, many educated men________.
［A］ become ignorant savage again ［B］ find the “time barrier” unbearable
［C］ will not combine solar and stellar space［D］ cannot adapt to the abrupt change of scale
14.Conservative scientists who deny that cosmic gulfs can ever be crossed will________
［A］ laugh at the very idea of flight ［B］ learn a lesson as they did ten years ago
［C］ find space travel beyond their reach［D］ oppose the fundamental scientific laws
15.The author of the passage intends to show__________