题目内容
After completing four-year study in a college, the student usually can earn a master's degree in the US.
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According to the U.S. Constitution, education is the responsibility of the federal government.
Americans have to join a political party in order to vote or to be a candidate for public office.
The American economy suffered severely from the two World Wars in the 20th century.
The Winner-take-all system is adopted in all states of the U.S.
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