C

    Do you like traditional Chinese paper-cutting? Ding Xiang, a student at Nongsishi Middle School in Xinjiang, is really good at it. At the eighth National Excellent Talents Competition last month in Beijing, the 15-year-old girl got the gold award（金奖） for her paper-cutting skills.

    At the competition, Ding cut a piece: Millennium Dream（千年梦想）. The piece has two papers. One shows an ancient cave painting(壁画) and the other a Chinese-made spaceship. The two papers form a sharp contrast（对比）. Ding said she wanted to show three things with the piece: China's long history, China's rapid development, and her hope for the future of paper-cutting. This piece helped Ding walk away with the gold award.

    "I was very surprised to get the award." Ding said in an interview with Yili Daily, a Xingjiang newspaper. "I should thank paper-cutting for bringing me the award."

    All the hard work has paid off. In two years, Ding's skills have improved a lot, and she has the gold award to prove(证明) it.

    Ding said she has learned a lot from paper-cutting. "I have learned to observe things carefully," Ding told Yili Daily. "I have become more confident, too. It is a great help in my studies. Also, I have learned a lot of history from the art."

氢能被视作连接化石能源和可再生能源的重要桥梁．

（1）水制取H₂的常见原料，下列有关水的说法正确的是____ 

a．水分子是一种极性分子

b．H₂O分子中有2个由s轨道与sp³杂化轨道形成的σ键

c．水分子空间结构呈V型

d．CuSO₄•5H₂O晶体中所有水分子都是配体

（2）氢的规模化制备是氢能应用的基础．

在光化学电池中，以紫外线照钛酸锶电极时，可分解水制取H₂同时获得O₂．已知钛酸锶晶胞结构如图所示，则钛酸锶的化学式为____ 

（3）氢的规模化储运是氢能应用的关键．

①准晶体Ti₃₈Zr₄₅Ni₁₇的储氢量较高，是一种非常有前途的储氢材料．该材料中，镍原子在基态时核外电子排布式为____ 

②氨硼烷化合物（NH₃BH₃）是最近密切关注的一种新型化学氢化物储氢材料．请画出含有配位键（用“→”表示）的氨硼烷的结构式____ ；与氨硼烷互为等电子体的有机小分子是____ ；（写结构简式）．

③甲酸盐/碳酸盐可用于常温储氢，其原理是：甲酸盐在钌催化下会释放出氢气，产生的CO₂被碳酸盐捕捉转变碳酸氢盐，碳酸盐又能催化转化为甲酸盐．已知HCO₃^﹣在水溶液中可通过氢键成为二聚体（八元环结构），试画出双聚体结构____ 

①表示欢迎；

②介绍与本地生活相关的信息（如气候、饮食等）；

③介绍本班情况；

④希望Chris做那些事情，以增进中美学生间的了解和友谊。

注意：①请勿提及与考生相关的真实信息；

②可行当加入细节，使内容更充实、行文连贯；

③词数不少于100；开头已给出，不计入总词数。

参考词江：

交换生 exchange student

Dear Chris,

    I' m Li Jin, Monitor of Class One,Grade Eleven.

Yours,

Li Jin