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。

为了全民健康，卫生部推广使用强化加铁酱油，这里的“铁”指的是____（填“单质”、“元素”或“原子”）。骨头汤中含有____元素，若人体缺少该元素可能导致骨质疏松。

材料一：对于中国人来说，这场战争是一块界碑，它铭刻着中世纪古老的社会在炮口逼迫下赶往近代的最初的一步。

——陈旭麓《近代中国的新陈代谢》

材料二：在这些战争中所遭到的耻辱性失败，迫使中国人打开大门，……重新评价自己的传统文明。其结果是入侵和反入侵的连锁反应。

——斯塔夫里阿诺斯《全球通史》

材料三：十九世纪六七十年代中国近代工业的两幅图片

在一系列中国特色社会主义制度中，最根本的政治制度是（    ）

若${\left(1+x\right)}^3+{\left(1+x\right)}^4+{\left(1+x\right)}^5+\cdots +{\left(1+x\right)}^{2012}=a_0+a_{1}x+a_2{x}^2+\cdots +a_{2012}{x}^{2012}$，则$a_3$等于（）