单项选择题

Even a very young animal has a strong ______ for self-preservation.

A．consciousness
B．impulse
C．instinct
D．response
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单项选择题
The ______ of influenza are fever, headache, and muscular pain.
A．responses
B．symptoms
C．property
D．reflections
单项选择题
The city is an important railroad ______ and industrial and convention center.
A．conjunction
B．network
C．junction
D．link
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