在空间直角坐标系O﹣xyz中，点A（1，2，3）关于z轴的对称点为（　　）

正确抄写下列字母，大写变小写，小写变大写。

①A ____  ②g ____    

③d ____    ④E____    

2014年12月28日7时，某国际航空公司一架从印度尼西亚飞往新加坡的客机失联，搜救工作随即展开。下图示意飞机飞行路线及搜索区域。读图完成下题。

在图示洋面搜索该失联客机碎片，主要采用的地理信息技术是(　　)

重10N的物体，只在重力和竖直向上拉力F的作用下，竖直向上运动．拉力F与时间t关系如图，下列说法正确的是（　　）

    It was a Monday morning. When a teacher walked into the1, he heard a low voice: “Here is the teacher. I am 2this boring fellow(烦人的家伙) is going to talk about putting in commas(逗号).” It was a boy's3. His name was Bill. He was talking4the boy next to him. The teacher didn't get angry. He said5about it, then he really began to talk about putting in commas, and then he wrote6the sentence: “Bill says the teacher is a boring fellow.” The class7and Bill's face8red. “Now,” said the teacher, “I'll 9you how important commas are.”

    He put two commas in the sentence, and now read, “10is a boring fellow.”