已知氢原子的基态能量为E1激发态能量En=E1n2其中n=2，3，4…．用h表示

（）是国际物流系统中运量最大的运输方式。

A.公路汽车运输

B.航空

C.海运

D.铁路运输

阅读理解。

     Though we were poor and struggling, my sister managed to buy me a pair of "magic shoes" that changed

my life.

     Anne is six years older than me. Growing up, we were very poor, and my mother worked evenings at a

factory in a small town. Not seeing my mother much, Anne took over much of the maternal support. During

those teenage years, Anne was always there for me, not only as a big sister, but as a mother and my best

friend.

     When I was seventeen and had no money, I thought my only chance of going to college was if I could

win a scholarship. I had an important interview for such an award. Anne at that time was struggling surviving

on a part-time job. I told her of my interview, that General Motors was sending me a bus ticket, and I would

get to visit the city for my scholarship interview. I was excited about the adventure and asked her advice on

what to wear. I showed her my best outfit and how I planned to be careful, how I sat so that the hole in the

bottom of my shoe would not be seen, but I wasn't sure what I would do if it rained.

     Anne suggested that we go shopping, and we took the bus to a store and we found a beautiful pair of

leather shoes on sale. She told me to try them on, but I thought it was just for fun as neither of us had ever

owned anything that expensive before. But this time was different, Anne handed me the boxed shoes and said,

"Here, I'll buy these for you."

     "But…" was all I could say.

     "You deserve them," she replied. "I want to see you get that scholarship."

     I went to the interview and crossed my legs so that my beautiful new shoes shone with pride. I won the

scholarship and became an engineer. Now, after twenty years have passed, I still have that pair of shoes with

me, and I just wear them on those little occasions when I need to feel special. It's kind of like having magic

ruby slippers when you're homesick.

1. Why did the author say that Anne was like the author's mother?

A. Because she took care of the author.

B. Because Anne was much older than the author.

C. Because Anne looked like the author's mother.

D. Because Anne admired the author's mother.

2. Anne suggested that they go shopping in order to ____.

A. buy a pair of new shoes for the author

B. buy a pair of new shoes for herself

C. repair the author's poor shoes

D. try on different kinds of clothes

3. The interview was successful probably because ____.

A. the interviewers noticed her new shoes and liked them

B. the author looked especially beautiful wearing the shoes

C. the author was confident with the new shoes on

D. the shoes are a pair of "magic shoes"

结焦时间

当三相电路对称时，三相瞬时功率之和是一个（），其值等于三相电路的有功功率，由于这种性能，使三相电动机的稳定性高于单相电动机。

四川省文物考古所专家陈德安在2000年12月16日举行的三星堆发掘新闻发布会上说，经过20年的考古发掘，三星堆遗址的文化面貌、内涵和特征已基本确定。

陈德安说，三星堆遗址是一处距今5000年至3000年左右的古蜀文化遗址，遗址内存在三种面貌不同但又连续发展的三期考古学文化，即以成都平原龙山时代至夏代遗址群为代表的一期文化，又称“宝墩文化”；以商代三星堆规模宏大的古城和高度发达的青铜文明为代表的二期文化；以商末至西周早期三星堆废弃古城时期为代表的三期文化，即成都“十二桥文化”。

在龙山至夏代的成都平原，三星堆的发展已超过周围其他城邑，并成为成都平原的中心城邑。目前在这一时期还未发现青铜器，但已出现独具地方特色且加工技术高超的玉器，其中具有良渚文化风格的玉锥形器和具有石家河文化风格的陶器出土，说明三星堆一期文化与长江中下游地区已有文化交流。

在商代，三星堆已发展成为高度发达的青铜文明中心，即早期蜀国，这是三星堆文明的鼎盛时期，也是2000多年的古蜀国历史进程中最辉煌的时期，代表了长江流域商代文明的最高成就。

陈德安说，这一最高成就可从很多方面体现出来，如规模超过周围城邑、具有政治中心性质的古城的出现，高度发达的青铜冶铸技术和黄金冶炼加工技术，规模可观的玉石器加工作坊和高超的玉石器加工技术，较为完善的宗教礼仪祭祀制度，自然水系与人工水系互相结合进行合理利用与治理等。在三星堆二期文化中，青铜文明的自身文化特点始终影响范围也超出了传统的古蜀国分布的成都平原，扩散到陕南地区的江汉平原等地。同时，青铜文明也受到了中原夏商文明及长江中游地区、陕南地区的方国文明的强烈影响，表现出古蜀文明强烈的内聚和外衍的两面性。

他还表示，三星堆古蜀国作为“高于氏族部落的、稳定的、独立的政治实体”，是中国古代中原周边地区具有典型意义的“古国”之一。三星堆文明作为长江上游地区中华古代文明的杰出代表，再次雄辩地证明了中华文明的起源是多元一体的。

作者认为“在商代，三星堆文化代表了长江流域文明的最高成就”，下列不能作为这一观点的根据的一项是（）。

A．三星堆规模宏大，具有政治中心的性质

B．能对自然水系进行合理的开放和利用

C．能和良渚文化与石家河文化进行交流

D．青铜冶铸技术和黄金冶炼加工技术高度发达