摘要：
1.题目People often have a preference among synonyms of the same word. For example, some may prefer "the poli... 阅读全文
摘要：
1.题目Mooncake is a Chinese bakery product traditionally eaten during the Mid-Autumn Festival. Many types of... 阅读全文
摘要：
1.题目For any 4-digit integer except the ones with all the digits being the same, if we sort the digits in n... 阅读全文