氧气瓶和乙炔瓶距明火必须保持（）以上，两瓶的距离不得小于（）米。
A、1.5
B、10.7
C、5.1
参考答案：B
－Mum, we have many shows about different festivals around the world . It’s very interesting.
－Great._____________.
A．I’m sorry to hear that
B．That's right
C．Have a nice day
D．Bad luck
人类的变态现象主要发生在精神，性格、情志与行为。
