7．聽第10段材料，回答第18至20題．
18．What is the reason for calling the USA a melting pot？
A．The people tend to gather in racial groups．
B．Its population consists of various kinds of peoples．
C．Most groups of immigrants（移民） have settled in large cities．
19．Where did the first immigrants to the USA come from？
A．England，Asia and Africa．
B．England and the Netherland．
C．England，F(xiàn)rance and Germany．
20．When did the greatest number of immigrants reach the USA？
A．From 1818 to 1914．
B．From 1820 to 1880．
C．From 1880 to 1914．

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