题目

My summer hols wr CWOT. B4, we usd 2 go 2 NY 2C my bro, his GF & thr 3: @ kids FTF. ILNY, it's gr8.Can you understand this sentence? If you can't, don't feel too bad. Neither could the middle school teacher in England who received this as homework. This is Netspeak: the language of computerized communication found on Internet or mobile phones. To newcomers, it may look like a completely foreign language. So, what is the ‘translation' of the sentence above? It means: My summer holidays were a complete waste of time. Before, we used to go to New York to see my brother, his girlfriend, and 一人乘电梯从底楼到顶楼，若从电梯启动时开始计时，18s末电梯到达顶楼停下，此过程中他对电梯地板的压力大小F与其重力大小G的比值随时间变化的图象如图所示，g取10m/s2，则底楼地板距顶楼地板的距离为（　　）A. 36m B. 40.5m C. 42m D. 45m