单项选择题

The strange orange lights were first seen_______.

A．from the ground
B．from a rocket ship
C．during World War I
D．during World War Ⅱ
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单项选择题
If the space animal theory is true, the creatures go down to the lower regions in order to_______.
A．escape detection
B．arouse curiosity
C．search for man-made energy
D．make contact with man
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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