单项选择题


Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
The International Labor Day was chosen by ______.

A．Socialists
B．American Congress
C．Capitalists
D．US workers
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单项选择题
When did Abraham Lincoln announce an order to free the slaves
A．1861.
B．1862.
C．1863.
D．1865.
单项选择题
What is The National Underground Railroad Freedom Center
A．A concert hall.
B．A museum.
C．A zoo.
D．A theme park.
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