单项选择题

______are bound morphemes because they cannot be used as separate words.

A．Roots
B．Stems
C．Affixes
D．Compounds
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单项选择题
Black people were first brought to America from Africa as______.
A．workers in factories
B．cotton pickers
C．migrants
D．slaves
单项选择题
The first settlement in Australia was made by the______.
A．English
B．Dutch
C．French
D．German
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