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【单选题】
联合国人口基金会的报告显示，世界人口总数在2011年10月31日达 亿，这表明科技和经济进步提高了人类生命的保障水平，同时人口迅猛增长也给全球资源和生态环境造成巨大压力。 [ ]
A.
65
B.
70
C.
80
D.
60
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】有数据表:借阅(借书证号,图书号,借阅日期,...),现要统计每位读者借阅的图书总数,在查询设计视图的网格中,字段借书证号和图书号所在列的总计行应分别选择
A.
group by,sum
B.
count,group by
C.
sum ,count
D.
group by,count
【单选题】Tim Richter and his wife, Linda, had taught for over 30 years near Buffalo, New York—he in computers, she in special education. "Teaching means everything to us", Tim would say. In April 1998, he lear...
A.
a well-known surgeon
B.
C.
B. a mother of a four-year-old
D.
C. a singer born in Tennessee
E.
D. a computer programmer