单项选择题

______ is called the "backbone of England".

A．The Rockies
B．The Pennines
C．The Appalachians
D．The Grand Canyon
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单项选择题
______ proposed the idea of the surface structure and the deep structure.
A．Bloomfield
B．Halliday
C．Saussure
D．Chomsky
单项选择题
If America had a national poet in the 20th century, it is certainly ______.
A．Frost
B．Pound
C．Poe
D．Whitman
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