单项选择题

The vowel [u:] in [fu:d] (food) is ______ vowel.

A．back
B．front
C．unrounded
D．central
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______ was formerly the chief source of executive power in the kingdom of Britain.
A．The Cabinet
B．The Privy Council
C．Parliament
D．The Sovereign
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The Federal Government of the U.S. is divided into ______ branches.
A．2
B．3
C．4
D．5
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