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
The Falkland Islands are called _____ by Argentina..
A．Islas Maldivas
B．Islas Malfore
C．Islas Maiands
D．Istas Maldavis
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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