单项选择题


Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
When did Americans celebrate May Day

A．The 1st of May.
B．The 1st of September.
C．The 1st Monday in September.
D．The 1st Monday in May.
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Why was the Statue of Liberty closed in 2001
A．Because it couldn’t endure the test of time and needed repairing.
B．Because it was threatened by terrorist attacks.
C．Because it was damaged by tourists.
D．Because it would endanger the visitors.
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