第9题: [单项选择]SQL实现分组查询的短语是______。 A. ORDER BY B. GROUP BY C. HAVING D. ASC 参考答案:B 答案解析:[知识点] 关系数据库标准语言SQL/SQL的数据查询功能 [评析] 4个选项中所列出的短语都是SELECT语句的短语,其中C选项HAVING不能脱离GROUP BY短语而独立存在,D选项ASC
第22题: [单项选择]Now, the most effective form of advertising is ______. A. a 30-second prime-time TV ad B. a 30-second prime-time online advertising C. online advertising D. most expensive TV ad 参考答案:C 答案解析:本题问“目前最有效的广告形式是什么”。相关部分在题文第一段第四行,"A 30-second prime-time TV ad was once considered the most effectiv