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．
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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
单项选择题
English belongs to ______ writing system.
A．word
B．syllable
C．sound
D．ideogram
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