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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单项选择题
A．mustB．mightC．mayD．will
A．must
B．might
C．may
D．will
单项选择题
A．AfterB．BeforeC．IfD．While
A．After
B．Before
C．If
D．While
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