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
Which of the following is an instance of backformation
A．Bicycle/bike.
B．Television/televise. C. Central Intelligence Agency/CIA. D. Motor hotel/motel.
单项选择题
English belongs to ______ writing system.
A．word
B．syllable
C．Sound
D．ideogram
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