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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单项选择题
Why was the United States called a melting pot
A．Most immigrants have settled in big cities.
B．Its population consists of people from various countries.
C．Most people tend to forget where their ancestors came from.
D．People gathered in racial groups.
单项选择题
What happens to students who miss more than four classes
A．They may fail the course.
B．They may not have to make up the work.
C．They may have to do additional assignments.
D．They may not understand the labs.
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