单项选择题

Living constantly in the atmosphere of slave, he became infected ______ the unconscious ______ their psychology. No one can shield himself ______ such an influence.

A．on
B．by
C．from
D．through
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单项选择题
Remember to ask for a______ of quality for the consumer goods; otherwise they will not of- fer any maintenance.
A．certificate
B．mark
C．warranty
D．receipt
单项选择题
Apple pie is ______ neither good nor bad; it is the way it is used that determines its value.
A．at itself
B．as itself
C．on itself
D．in itself
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