第1题: [单项选择]The price drop of crude oil is beneficial in that it A. helps to revitalize the world economy. B. promotes oil export to other nations. C. helps to push up the regional economy. D. provides an opportunity to the oil exporters. 参考答案:A 答案解析:[解析] The decline in oil priees triggered last week by a row between major world crude produc
第10题: [单项选择]如果对关系S(number, name, score)成功执行下列SQL语句： CREATE CLUSTER INDEX name_ index ON S(score) 对此结果的描述中，正确的是( )。 A. 在S表上按salary升序创建了一个唯一索引 B. 在S表上按salary降序创建了一个唯一索引 C. 在S表上按salary升序创建了一个聚簇索引 D. 在S表上按salary降序创建了一个聚簇索引 参考答案:C 答案解析:[解析] SQL用CREATE INDEX语句创建索引。其一般格式为： CREATE [UNIQUE][CLUSTER]INDEX＜索引名＞ ON＜表名＞(＜列名＞[＜顺序＞[，＜列名＞[
第15题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. At Business Center. B. At Convention Center. C. In Grand Room. D. In a nice restaurant. 参考答案:C 答案解析:[听力原文] Q: Where will the conference be arranged
