单项选择题

The words "color" and "idea" are called ______ because they can occur unattached.

A. derivational morphemes
B. bound morphemes
C. inflectional morphemes

D. free morphemes
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单项选择题
Keats’ most important and mature poem form is ______.
A. ode
B. elegy
C. epic
D. sonnet
单项选择题
The natives of the Continent of North America are the
A. Aborigines.

B. Maoris.
C. Indians.
D. Inuits.
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