29.The police tried to get some clues from the suspect, but he remained________
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A
silent
B
quiet
C
calm
D
secret
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The air in mountain areas is ____ that in big cities.
#19283
A
as fresh as
B
fresher than
C
as dirty as
D
dirtier than
The _______age of the students in our class is about 19.
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A
common
B
average
C
usual
D
ordinary