单项选择题

The Silicon Valley is situated in ______.

A．California
B．New Mexico
C．Florida
D．Arizona
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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
单项选择题
______ was a founding figure in the history of American horror stories and detective stories.
A．JamesF. Cooper
B．Edgar Ellan Poe
C．Washington Irving
D．Herman Melville
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