严重低钾血症病人可出现
A．肌无力
B．腹胀
C．肠麻痹
D．反射迟钝或消失
E．尿排钾减少
参考答案：A, B, C, D, E
—Who is the most ___________ student in your class?
—I think Jimmy is. He is very out going, helpful and creative.
A．popular
B．clever
C．friendly
D．patient
使用价值是指（）的有用性，即（）能够满足人们某种需要的属性。
