单项选择题


A．taken
B．considered
C．defined
D．thought
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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 such lights in space
C．according to an interesting theory, the orange lights are space animals
D．the mysteries of nature can be completedly explained
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 the earth
D．visit the earth's surface
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