单项选择题

Human beings are ______creatures, designed to be on the move.

A．distinctive
B．dynamic
C．intrinsic
D．mysterious
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单项选择题
New research methods are being brought to ______the subject.
A．bear on
B．pick up
C．take apart
D．bring on
单项选择题
Airborne germs are ______ yet surprisingly few are virulent; despite the fact we inhale them with nearly every breath, the vast majorities of them are innocuous and are neutralized easily by our immune system.
A．ubiquitous
B．intolerable
C．omnipresent
D．plentiful
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