膝关节囊内有哪些关节的辅助结构?
参考答案：
有前交叉韧带和后交叉韧带及内侧半月板和外侧半月板。
English is a language that many people around the world not speak perfectly but at least can understand．
A．could
B．would
C．will
D．may
夏天，打开冰棒的包装纸，会看到冰棒周围在冒“白气”，这是_________现象；今年冬天，我国北方频繁降雪，雪的形成是_________现象。
