题目

有人调侃，等红绿灯时红灯停绿灯行，黄灯亮时看心情，黄灯亮时一定不要再行驶了，若稍有不慎将命丧黄泉，道路如图甲所示，街道宽16米，某人沿人行横道走过街道所需时间为8秒。（1）此人走过街道的平均速度是多少？（2）街道上有一辆汽车，正以72km/h的速度沿街道向行人行横道驶来，当此人刚踏上人行横道时，汽车距离人行横道150米，假定二者速度不变，问人先过完街道还是汽车先到达人行横道？（3）在汽车驾驶室内，驾驶员通过左右两侧后. I’m sorry to have known my train arrives in New York at eight o’clock tonight. The plane I would like to take from there ____ by then. A．will have leftB．would leaveC．had leftD．has left