在EXCEL的工作表中，要统计50人的数学平均成绩，应使用下列哪个函数。（）
A、SUM
B、AVERAGE
C、MAX
D、RANK
参考答案：B
Little Tom was very nervous in front of so many strangers, so he ____ and ran to his mother. [ ]
A. turned out
B. turned off
C. turned down
D. turned around
治疗上呼吸道感染的措施，下列哪项不妥
A．适当休息B．体温超过39℃时物理降温C．呼吸道隔离，防止交叉感染D．多饮水E．常规应用抗生素治疗
