单项选择题

What was the purpose of the immigration law passed in the 1920’’s

A．To impose restrictions on further immigration.
B．To improve the working conditions of immigrants.
C．To set a minimum wage level for new immigrants.
D．To put requirements on languages for newcomers.
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For how long can a reader keep the book before he renews it
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B．One month.
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The author called Wikipedia people’’s encyclopedia because it________
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