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
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单项选择题
______are bound morphemes because they cannot be used as separate words.
A. Roots
B. Stems
C. Affixes
D. Compounds
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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