到2010年底，我国投入运营的高速铁路约7500千米，图3显示我国某段高速铁路景观。据此完成1~3题。
1、为了保持列车高速运行，高速铁路选线时首要考虑的自然因素是[ ]
A、地形
B、地质
C、气候
D、水文
2、在平原地区，建筑高速铁路时多采用高架的方式。主要是为了 [ ]
A、减少噪音扰民
B、较少占用耕地
C、缩短运营里程
D、保护野生动物
3、我国高速铁路网建成后，下列区段中，民航客运业受冲击最大的是 [ ]
A、武汉—广州
B、杭州—上海
C、成都—上海
D、兰州—北京
1、A
2、B
3、A
DIY is very poplar in China now. Do you know what it is? Yang Chen works ________ a computer business in Beijing. Though he enjoys his work, it is hard for him ______after work. “ for a long time, I had no choice except going to a bar for a drink and karaoke to relax myself,” he said. One day ________ he saw many toys in a toy shop, he had an idea. “ why _______ some kind of things and relax myself?” Then he began to ________ model planes, model ships and something else. The things he has made by himself don’t look as professionally(专业的) made as those in the shop, ________ he likes doing it. “ Maybe it is not as much fun ______ as things which are bought expensively from the shops,” he said. Now his bookshelves are full of many kinds of things he has made. They are very beautiful and his friends _______ them very much. More and more people are like Yang, making or creating(创造) things of their own. They like to do it __________. Though making things with our own hands may _______ much time, some people enjoy doing it, now known as DIY-do-it-yourself, very much. They can make all kinds of things they like. DIY is becoming more and more popular in China.
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