单项选择题

Many people like white color as it is a ______ of purity.

A．symbol
B．sign
C．signal
D．symptom
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单项选择题
Their products are frequently overpriced and ______ in quality.
A．influential
B．inferior
C．superior
D．subordinate
单项选择题
The ______ goal of the book is to help bridge the gap between research and teaching, particularly between researchers and teachers.
A．intensive
B．concise
C．joint
D．overall
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