Why did Bob Parks radio wake him up 1/2 hour earlier than usual? A.The electricity had gone off during the night. B.Bob had set the alarm wrong. C.Bob did not want to be late. D.The Internet had informed the radio of a traffic jam.
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Webber is afraid dogs might _______. A. bark while he is shooting B. get into his picture C. steal the food D. upset his camera
请在第_____处填上正确答案。 A.messages B.letter C.information D. words
计算分半信度需要的复本个数和施测次数为:A.1,1B.2,1C.2,2D.1,2
一组测验分数服从正态分布,其平均数为65分,标准差为5分,则分数在60~65之间的人数占总人数的百分比为。 A.15.8%B.34.1%C.50.0%D.68.3%