12.参考答案A说明分析:铁路沿线站点密度的大小取决于沿线人流量的多少,所以北京北站至东花园北站站点密度大的根本原因是人口密度大。图示信息无法确定工业景点和建筑密度13.参考答案C说明分析:八达岭长城站埋藏深度超过100米的主要原因是减轻地面震动,从而保护八达岭长城。保持温度恒定、节约建设用地、避免雨水渗漏没必要埋藏深度超过100米。

Li Hu第二节(满分25分)Green realized it was an emergency. Mary might faint at any time. If she couldnt receivetimely help, she would suffer severe brain damage, or even die, which would definitely scare hertwo grandchildren. Concerned that she was in such a critical situation where every minute countedfor her life, he immediately called the hospital to find her an ambulance. After being informed ofwhat was going on, two teachers dropped everything without delay, climbed into Greens car andset off. (75 words)When Green and the other two teachers reached the family's home less than ten minutes later,seeing what was happening, they sighed in relief. Everything was well in order. The doctors weregiving first aid to Mary, pressing on her chest. The two kids looked visibly shaken, close to tearsBeside them stood Julia, holding them in her arms and comforting them. Fortunately enough, thequick response from Julia and Green saved Marys life. When she came to herself, she was lifted tothe ambulance and rushed to the hospital. Everybodys face brightened up as the ambulance fadedaway. (75 words

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