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

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单项选择题

What trick had Lewis learnt ii} the army

A．Opening windows from the outside.
B．Climbing pipes.
C．Getting money from people.
D．Making beds.

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