单项选择题

By moving the radar beam around slowly in circles, we can （）the surroundings.

A、explore
B、expose
C、exploit
D、expand

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It is extremely urgent that they ______ from the mountain before dark.
A．must be rescued
B．should rescue
C．can be rescued
D．be rescued
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He thinks he will do it himself ______ asking his parents for help.
A．rather than
B．other than
C．instead of
D．in place of
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