气分证的病人可出现
A．心烦口渴B．不寐C．两者均有D．两者均无
参考答案：A
He was reading a very interesting story, completely_______himself in the story.
A．lost
B．being lost
C．to be lost
D．losing
如何根据原水中要去除离子的性质，选择离子交换树脂？
