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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热门试题

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

A．difficultyB．troubleC．caseD．problem

A．difficulty
B．trouble
C．case
D．problem