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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单项选择题
The space animal theory would seem to indicate that ______.
A．living creatures are extremely adaptable
B．life in space is impossible for man
C．the fittest creatures always survive
D．life cannot exist in the depth of the sea
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
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