单项选择题

America's most important food crop is ______.

A．wheat
B．rice
C．corn
D．oats
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单项选择题
Transformational-generative grammar (TG) is of ______'s great contribution to linguistics development.
A．Saussure
B．Halliday
C．Bloomfield
D．Chomsky
单项选择题
______ is the substitution of an agreeable or inoffensive expression for one that may offend or suggest something unpleasant. For instance, we refer to die as pass away .
A．Hyperbole
B．Metaphor
C．Euphemism
D．Oxymoron
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