( ) 1. What do people do before the Spring Festival?

( ) 2. Why do people make zongzi on the Dragon Boat Festival?

( ) 3. What do people do on the Mid-Autumn Festival?

( ) 4. What does the number nine mean in Chinese culture on the Chongyang Festival?

【解析】：本题主要考查了对于中国传统节日的理解以及阅读短文后的细节把握。题目给出了四个关于中国传统节日的问题，需要根据短文内容选择正确答案。这要求我们不仅要了解中国的传统节日及其习俗，还要能够准确理解并把握短文中的关键信息。
对于第一个问题，"What do people do before the Spring Festival?"，短文中明确提到，"Before it comes, families clean their houses. They want to sweep away bad luck. Then, they put up red couplets."，即春节前，家家户户会打扫屋子并贴上红色的对联。因此，选项B "Clean houses and put up red couplets." 是正确的。
对于第二个问题，"Why do people make zongzi on the Dragon Boat Festival?"，短文中指出，"The Dragon Boat Festival is on the fifth day of the fifth lunar month. It is to remember a great poet named Qu Yuan. People make zongzi."，即端午节是为了纪念屈原，人们会包粽子。因此，选项B "To remember the poet Qu Yuan." 是正确的。
对于第三个问题，"What do people do on the Mid-Autumn Festival?"，短文中描述，"The Mid-Autumn Festival is on the 15th day of the 8th lunar month. Families sit outside at night. They look at the moon and eat mooncakes."，即中秋节晚上，家人们会坐在一起赏月并吃月饼。因此，选项C "Eat mooncakes and look at the moon." 是正确的。
对于第四个问题，"What does the number nine mean in Chinese culture on the Chongyang Festival?"，短文中明确提到，"The Chongyang Festival is on the ninth day of the ninth lunar month. In China, the number nine means long life."，即在重阳节，数字“九”在中国文化中象征着长寿。因此，选项B "Long life." 是正确的。
【答案】：1. B；2. B；3. C；4. B。