急性肾功能衰竭患者电解质失调，以下哪项危害最为严重（）
A.低血钠
B.高血钾
C.低血钙
D.高血磷
E.高血镁
参考答案：B
Kate works ______ a school. Her father works ______ a farm. [ ]
A. in, in
B. in, on
C. on, in
D. on, on
色键
