12.C【解析】由图可知,高铁的西北段沿线位于河西走廊,狹管效应明显,多大风天气,因此高铁的西北段沿线设有独特防护设施的用途是防大风。13.D【解析】由图可知,高铁的东南段明显弯曲(经过西宁市附近),主要是考虑交通对沿线经济的带动作用和客流量,因此造成图示高铁东南部有明显弯曲的影响因素是城市。

第二节One possible version:Welcome to Model Aircraft ClubDo you dream to explore the sky? Do you like to makeyour own flying machine? Do you want to meet differentpeople and get to know different things? Come and join usin the model aircraft club!Here, we hope to enrich your life, motivate your imagination and develop your sense of workmanship. A widevariety of activities are held every month. Experts are invi-ted to give lectures about model aircraft regularly. Anyoneinterested in model airplane and the knowledge of space iswarmly welcomedWant to be a member? Let's start from clicking anapplication e-mail to modelaircraficlubl63. com before May5th. Looking forward to your participation第三节One possible version

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