下列山脉中，既位于我国阶梯的交界处，又是我国季风区与非季风区分界的是（　　）

学校买来钢笔若干枝，可以平均分给（x﹣1）名同学，也可分给（x﹣2）名同学（x为正整数）．用代数式表示钢笔的数量不可能的是（　　）

    One a snowy evening, a rich lady was standing by the road. She was very worried. Her____ had broken down. Just then a poor man named Robert came. He was on his way back home from work as usual.
    The lady thought, “Is the man going to help me? He looks very cold and hungry. ”But to her ____ , he stopped and said with a smile, “What’s wrong, madam?” The lady told him what was happening.
    After forty minutes, the car was at last fixed by Robert. The lady wanted to pay him.
  “No, that’s ____  , madam.” he said, “I was just helping someone in need. If you really want to pay me back, I hope you ____ see someone in trouble, please give him a hand.” A few minutes later, the lady saw a shabby house by the road. She  ____  Robert's words, so she stopped. The hostess warmly asked her in. The lady could see that was a ____  family and they needed help. When the hostess was making tea in the kitchen, the lady ____ 500 dollars on the table and went away quietly. Robert came home later than before, thinking how hard their life was. Their ____  was to be born the next month but there wasn't ____  money. His wife went up to him, gave him a kiss and said softly, “Don't worry, dear! Everything’s going to be all right. A stranger has helped us out. ”
Let's always be ready to help others because helping others is helping ____  .

鲁迅回顾历史说：“中国太难改变了……不是很大的鞭子打在背上，中国自己是不肯动弹的。”第二次鸦片战争的一鞭，使中国开始认识到要学习西方军事技术，于是开始了（    ）

阅读理解

    Tim Berners-Lee is not the most famous inventor in the world．However，his invention has changed our lives．

    He was born in London，England in 1955．When he was a small boy，Tim was interested in playing with electrical things．He studied science at Oxford University．He made his first computer from an old television at the age of 21．

    Tim started working on early computers．At that time，they were much bigger than now．He worked in England then Switzerland．Tim was really interested in two things，computers and how the brain works．How could the brain connect so many facts so quickly？He had to work with people all over the world．They shared information about computers．It was hard to manage all the information．He answered the same questions again and again．took a lot of time．It was even difficult for computers in the same office in Switzerland to share information．Tim also forgot things easily．Could a computer work like a brain？Could it"talk"to other computers？

    There was an Internet already but it was difficult to use．In 1989，Tim Berners﹣Lee invented the World Wide Web（WWW） all by himself．This had a special language that helped computers talk to each other on the Internet．When people wanted to share information with others，they used the World Wide Web．The Internet grew quickly after that．

    Tim Berners﹣Lee doesn't think he did anything special．He says that all of the ideas about the Internet were already there．All he did was to put them together．He says that many other people worked together to make the Internet what it is today．

    Most inventors want to become rich．But Tim gave away the World Wide Web for nothing．He now works in America．He helps people share technology and wants the Internet to be free for everyone to use．Maybe he is the most important but least famous inventor in the world today!