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。

友情提示： 碱石灰的主要成分为生石灰和氢氧化钠；新鲜的血液，遇一氧化碳由鲜红变为暗红。

图一：甲中放一盆正常生长的绿色植物，乙处为一装有清水的U形管，丙处放一只健康的小白鼠，丁中加入一定浓度的NaOH溶液，在适宜的温度下进行实验．图二表示该植物在适宜的温度和其它相关条件下净光合速率的变化趋势．据图分析回答下面的问题．

（1）图一中开关①打开，②③关闭，若不给光照，装置内____ （物质）含量将增加．

（2）图一中开关①打开，②③关闭，若给予适宜的光照，同时给装置甲中的植物提供适量的含¹⁸O标记的水，装置丙中小白鼠能较长时间的存活，小鼠体内含¹⁸O的物质产生的场所是____ ．这段时间内C处液面____（选填“逐渐上升”或“逐渐下降”或“保持不变”）．随后开关①关闭，②③打开，甲中生物叶肉细胞的C₅含量____ ．一段时间后，小白鼠血液中的____（物质）将会有所积累．

（3）据图二分析，该植物的呼吸速率在上述条件变化下____ （选填“相同”或“不同”）；当CO₂浓度为c时，不同光强组净光合速率不同的原因：____ ．

（4）由上述一系列实验可知，影响光合作用的环境因素有____ 等．

地球上最大的生态系统是（  ）

如图是人体血液与组织细胞之间的物质交换示意图，请根据图回答下列问题：