单项选择题

The author of the passage, readers can infer, intends to show the ______.

A．limitations of our technology
B．vastness of the cosmic reality
C．prospect of planetary travel
D．psychological impact of time and space
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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
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
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