视神经炎可有()
A．眼球转动痛
B．相对性瞳孔传入障碍
C．红绿色觉异常
D．VEP异常
E．以上都对
参考答案：E
If you keep ______ ,you’ll be a very good swimmer one day.
A．practising to swim
B．practising swimming
C．to practise to swim
D．practise swimming
