单项选择题

Among the ever increasing influx (流入，涌进) of land-hungry people from abroad throughout the early period of American Westward expansion, Germans and Irish were_______.

A．permanent
B．predominate
C．abundant
D．turbulent
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单项选择题
If the boxer is no match to his challenger, it's easier to ______ his outcome.
A．predict
B．precede
C．prevail
D．preclude
单项选择题
Though irritated inside by the insulting question, he ______ nothing in his response.
A．gave away
B．let down
C．put away
D．cut away
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