【正确答案】 C

【答案解析】[听力原文]
Since ancient times, May first has been a traditional day to celebrate spring. In modern times, May Day also became a traditional day for countries to honor workers.
In eighteen eighty-nine, Socialists held an international congress in Paris. They chose May first as a workers' holiday and a day for demonstrations. Since then, the first of May has been observed as International Labor Day.
The United States, however, had already settled on another day. Peter McGuire was a New York labor leader. He is said to have suggested the first Monday in September as a holiday to honor labor. He said it was a nice time of the year for a celebration. He suggested parades to show the strength of labor organizations. And he urged people to end the day with outdoor parties.
The first Labor Day celebration in the United States took place in New York City on September fifth, eighteen eighty-two. About ten thousand workers marched through the streets. Then everyone went to a park to eat a meal and hear speeches and music. The idea quickly spread throughout the country. In eighteen ninety-four, Congress approved a bill to declare Labor Day a national holiday.
For years, the first Monday in September was a day when American workers demonstrated for better conditions and pay. Today, the Labor Day weekend is mostly observed as a time to enjoy the last warm days of summer.

【正确答案】 A

【正确答案】 C

【正确答案】 D