单项选择题

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

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热门试题

单项选择题

For light to travel across the solar system, it will take ______.

A．a year
B．nearly a day
C．two months
D．thirty minutes

单项选择题

Confronted with the new groups of cosmic reality, many educated men ______.

A．become ignorant savages again
B．find the "time barrier" unbearable
C．will not combine solar and stellar space
D．cannot adapt to the abrupt change of scale