单项选择题

We should recognize that every company and every person is part of a long ______ of customers and suppliers.

A．pool
B．line
C．stream
D．chain
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单项选择题
She had a guilty ______ about not telling the police what had actually happened.
A．consciousness
B．conscience
C．consequence
D．confusion
单项选择题
As the saying goes, reading without reflecting is like eating without ______.
A．chewing
B．tasting
C．digesting
D．releasing
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