【单选题】延缓再生修复的因素是
D.
服用维生素B 2 ,维生素B 6 ,维生素A
【判断题】Nodding head in India is "Yes".
【单选题】While visiting the robot exhibition, the professor kept nodding his head to express his _______ with his students’ work.
【判断题】Nodding head in China is "No".
【单选题】Generally speaking, nodding your head is______ to saying yes.