单项选择题

All of the following words except ______ are formed through a process of derivation.

A．unconscious
B．discard
C．hospitalize
D．shortened
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单项选择题
The Silicon Valley is situated in ______.
A．California
B．New Mexico
C．Florida
D．Arizona
单项选择题
In English many nouns can be turned into verbs without any change to their form. For instance, the noun walk can be turned into the verb to walk. This phenomenon is known as ______ in morphology.
A．compounding
B．derivation
C．conversion
D．inflection
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