参考答案

正确答案：D
解析：细节判断题。由“From a safety standpoint，a lot of the older planes were built tougher and with proper maintenance，there’s no reason why a plane can't stay safe for 25 tO 30 years．”可知从安全角度来讲，使用年限较久的飞机能够采用更加坚固的材料，合理保养，能够安全使用25～30年。D选项属于内部装修，和舒适感相联系，与安全性能无关。所以选D。