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
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单项选择题
Didn't you know that the naughty girl used to skip classes
A．attend classes in time
B．miss classes
C．cheat in classes
D．be unhappy about classes
单项选择题
Marxism doctrine was spelled out in the Communist Manifesto.
A．evaluated
B．detailed
C．supported
D．mentioned
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