题目

灯笼，又称彩灯，是一种古老的中国传统工艺品．每年的农历正月十五元宵节前后，人们都挂起红灯笼，来营造一种喜庆的氛围．如图是某节日挂出的一只灯笼，轻绳a、b将灯笼悬挂于O点绳a与水平方向的夹角为，绳b水平．灯笼保持静止，所受重力为G，绳a、b对O点拉力分別为F1、F2，下列说法正确的是（ ）A. B. C. F1和F2的合力与灯笼对地球的引力是一对平衡力D. 灯笼只有重心位置处受重力作用，其他位置不受重力句型转换【小题1】The old man is so angry. He can’t say a word.（连成一句）The old man is ______ ______ ______say a word.【小题2】I bought the bike ten years ago. (同义句)I ______ ______the bike ______ ten years ago.【小题3】The key is used for locking the front door.（就划线部分提问）______ the key _______ for?【小题4】You should hang the curtains across the stage.（改为被动语态）The curtains _______ ______ ______across the stage.【小题5】Our school has changed greatly in the past several years.（同义句）There ______ ______ great changes in the past several years.