如图，已知A，B，C，D是同一直线上的四点，看图填空：AC=____+BC，BD=AD﹣____，AC＜____．

盛产于河南的“南阳玉”是中国四大名玉之一，“南阳玉”色泽鲜艳，质地细腻，透明度高。“南阳玉”的主要成分是CaAl₂Si₂O₈。关于CaAl₂Si₂O₈，下列说法正确的是（ ）

下列句子的横线上填入相应的词语，恰当的一项是（  ）。

  国民党将领汤恩伯吹嘘南京城防___________，但人民解放军仅用了24小时就冲破了敌人的防线。

  王小玉的演唱真是___________，赢得了满场观众的喝彩。

白衣战士们___________，克服重重困难，帮助“非典”病患者战胜病魔。

形式多样的文艺节目不断出现，有如___________。

短文改错。

    Holidays are fun but they also give thieves a lot of chances steal____  things.Follow my advice, and you will safe____ during holidays. Even though you might be busy shop____, always notice what is going on around you____. You never know when someone might be trying to steal something from you pockets. Don't forget____  your bag in your car. It's also important to take care of your homes during the holidays.