Question 24 is based on the passage you have just heard.

听力原文：

    Do you know where a mule comes from? It is the child of a donkey and a horse. （22）Mules have strong muscles like horses, but they eat less, can work longer, and are gentler, like donkeys.

    George Washington was the first person in the United States to own mules. He had heard that mules made good farm animals and he contacted the U.S. ambassador in Spain to ask about them.（23）In 1785, King Charles III of Spain sent Washington a male donkey as a gift. That male donkey became the father of the mule industry in the U.S.

    Every April, Maury County holds a Mule Day celebration. Held in Columbia, Tennessee,（24）Mule Day had its beginnings as “Breeder’s Day” in the 1840s. Farmers and farm animal breeders would bring their animals to market every April to show, buy, and trade. This was an important business before the days of tractors, when many families made a living from farming and mules were used as work animals.（25）Eventually, tractors began to replace mules, making them less in demand.

    A parade was added to Mule Day in 1934 to attract more people. Over the years other activities have been added, and today more than 200,000 people show up each year to watch and participate. If you visit during Mule Day celebrations, you might see a mule-driving contests, a square dances, horse shows or even tree-cutting competitions.

24. What did famers usually do on Mule Day in the 1840s?

解析：C。本题目为细节题。问题为：在19世纪40年代，农民会让骡子做什么？根据原文“Farmers and farm animal breeders would bring their animals to market every April to show, buy, and trade.”，可知农民和农场动物饲养员会将他们的动物带到市场上展示、买卖和交易。故正确答案为C）They showed and traded animals in the market（他们展示和交易这些动物）。