【题目】“坐北朝南”就是背对着北方,面向南方。我国古时的房屋多是坐北朝南而建,请你利用所学谈谈原因。
【答案】我国的宅舍习惯为“坐北朝南”。我国位于北半球,绝大部分处在北温带,太阳多从东偏南升起,从西边落下。冬季,太阳高度角较小,住宅的门、窗朝南,可使更多斜射的太阳光线进入室内,从而提高室内温度。而在夏季,太阳高度角增大,太阳从门、窗射入的光线相对就少,从而能保持室内有一定的凉意。(只要答出冬季可进入更多阳光提高温度,夏季进入较少阳光降低温度即可)
【解析】
本题主要考察太阳方位及太阳高度的知识。我国冬季,太阳从东南升起,太阳高度小;我国夏季,太阳从东北升起,太阳高度大。房屋朝向与太阳方位与太阳高度有关。
“坐北朝南”就是背对北方,面向南方。我国大部分地区位于北回归线以北,即北温带地区。冬季,太阳从东南方向升起,太阳高度小,房屋面向南方,可使更多斜射的太阳光线进入室内,从而提高室温。夏季,太阳从东北升起,太阳高度大,太阳从门窗射入的光线少,室内较凉爽。
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(C)
There are so many traffic accidents now. Many people are killed or hurt everyday on roads. It's becoming a more and more serious problem. Why?
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