单项选择题

When did the greatest numbers of immigrants reach the United States of America

A．From 1840 to 1880.
B．From 1880 to 1914.
C．From 1818 to 1914.
D．From 1820 to 1890.
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When does the professor have office hours
A．Mondays.
B．Wednesdays.
C．Fridays.
D．Monday through Friday.
单项选择题
How did John Adams make his living
A．He trained soldiers.
B．He was a smith.
C．He was a silversmith.
D．He was a politician.
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