单项选择题

All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.

A．as a result of
B．considering
C．cognizant of
D．whatever
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单项选择题
The ability to react to environmental stimuli is a basic and general characteristic of living organisms.
A．reject
B．repeat
C．return to
D．respond to
单项选择题
The Pullman Strike of 1894 tied up transportation and was finally ended only by government intervention.
A．relied upon
B．hindered
C．linked with
D．imitated
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