George couldn’t remember when he first met Mr. Anderson, but he was sure it was Sunday because everybody was at church. A. /; the B. the; / C. a; / D. /; a 答案:Ca Sunday泛指某一个星期天;at church为固定搭配,不用冠词,意为“在做礼拜”。(1)实验室中有一种游标卡尺,其游标尺有10格,总长为19mm.游标上每格比主尺上2mm少0.1mm,故其精度为0.1mm.如图所示,用这种游标卡尺测量小球的直径,则直径为 mm.(2)某同学欲测一单摆的周期,如果测得单摆完成30次全振动时秒表的示数如图所示,那么秒表的读数是 s,该单摆的摆动周期是 s.(保留三位有效数字)