单项选择题

A (n) ______ is a unit that is of distinctive value. It is an abstract unit, a collection of distinctive phonetic features.

A．phone
B．sound
C．allophone
D．phoneme
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单项选择题
One of Nathaniel Hawthorne's masterpieces is ______.
A．The Scarlet Letter.
B．The Fall of the House of Usher.
C．Note of a Native Son.
D．The Streetcar Named Desire.
单项选择题
In Britain, the Changing of the Guard takes place in ______.
A．Buckingham Palace.
B．Downing Street.
C．Victoria and Albert Museum.
D．The Tower of London.
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