某样品中可能含有碳酸钠、硝酸钾或硝酸钡三种中的一种或几种．现将10.6克样品加入足量的水，样品全部溶解，再加入过量的氯化钙溶液，得到10克沉淀，对样品中的组成判断合理的是（　　）

默写古诗词中的名句名篇。

①会当凌绝顶，____。

②____，归雁入胡天。

③无可奈何花落去，____。

④以中有足乐者，____。

⑤山水之乐，____。

⑥____，自缘身在最高层。

⑦____，忽复乘舟梦日边。

⑧____，西北望，射天狼。

⑨默写曹操《观沧海》中写想象之景、表现诗人博大胸怀的四句诗。

____，____。

____，____。

    Years ago,Tareq and his family left their home in Bangladesh to New York City, USA. Tareq was only 12 years old then.

    In Bangladesh, Tareq's dad was a farmer. He worked hard for little pay. Every day, Tareq walked 6 kilometers to school. After school, he had to work on the farm.

    But Tareq had fun. He loved singing and playing cricket (板球) with his friends. One day Tareq's dad told him they would move to New York City. Tareq's dad found a new job there, and he thought life would be better there.

    In his new school, Tareq tried his best to understand (理解) his teachers, but it was quite hard. Also, he had few friends.

    Things changed (改变) when he started high school. His high school had students from 30 countries and a cricket team. Tareq was excited to join the cricket team. He was happy to be with kids who loved the game as much as he did. He practiced before and after school. "Playing with the cricket team was the first time I felt accepted in America," he said. "When you play, it .doesn't matter what grade you' re in or what language you speak."

    During his second year in high school, Tareq was named the cricket team's most valuable player (最有价值球员).

    Tareq will go to university next year. He said, "Most universities don't have a cricket team. But that's OK, because cricket was there for me when I needed it most."

根据材料内容选择最佳答案。

矩形是中心对称图形，对矩形ABCD而言，点A的对称点是点____．