单项选择题

The most densely populated region of America is ______.

A．the southeastern part
B．the northeastern part
C．the northwestern part
D．the Middle Plains
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单项选择题
English belongs to ______ writing system.
A．word
B．syllable
C．sound
D．ideogram
单项选择题
______is not one of Mark Twain's works.
A．The Adventures of Tom Sawyer
B．The Adventures of Huckleberry Finn
C．Life on the Mississippi
D．The Portrait of a Lady
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