单项选择题

He studies ______ science of sound.

A．×
B．the
C．an
D．a
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单项选择题
Many people are still in ______ habit of writing silly things in ______ public places.
A．a, ×
B．the, an
C．the, the
D．the, ×
单项选择题
______ child as he is, he knows a lot of English.
A．The
B．A
C．×
D．An
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