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
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
单项选择题
The fact that it will never be possible to converse with someone on another planet shows that ______.
A．certain universal laws cannot be prevailed against
B．no object can ever travel faster than light
C．western culture has a special idea of communication
D．radio messages do not travel fast enough
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