单项选择题

The ______ of influenza are fever, headache, and muscular pain.

A．responses
B．symptoms
C．property
D．reflections
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单项选择题
The city is an important railroad ______ and industrial and convention center.
A．conjunction
B．network
C．junction
D．link
单项选择题
This could be the result of laziness or ______ which would lose him his customers or his job.
A．integrity
B．denial
C．deduction
D．incompetence
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