单项选择题

The duties of a policeman are ______ than

A．dangerouser, a teacher
B．more dangerouser, a teacher
C．greater danger, those of a teacher
D．more dangerous, those of a teacher
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单项选择题
--Is your mother of the same age as your father--No, my father is S years ______ my mother.
A．as old as
B．senior to
C．much older
D．seniors
单项选择题
--How ______ can you finish the drawing--In about half an hour.
A．long
B．soon
C．often
D．much
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