单项选择题

The theory says that during the daytime the space animals_______.

A．glow brightly in the sky
B．are invisible
C．can be seen from earth
D．visit the earth' s surface
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单项选择题
The best statement of the main idea of this passage is that_______.
A．Captain Nash saw twelve orange lights moving at a fantastic rate of speed
B．Captain Nash may have been the first to see lights in space
C．according to an interesting theory, the orange lights are space animals
D．the mysteries of nature can be completedly explained
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