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 not one of the greatest 20th century American playwrights.

A．Eugene O'neill
B．Tennessee Williams
C．Arthur Miller
D．William Faulkner

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