原发性醛固酮增多症出现的代谢紊乱为（）
A.尿钾排出减少
B.尿钾排出增加
C.高钾血症
D.血浆肾素水平升高
E.血浆醛固酮水平下降
参考答案：B
离子钙所带的正电荷数为（）
A.1个
B.2个
C.3个
D.4个
E.5个
Every year a flood of farmers arrive in Shenzhen for money-making jobs they（）before leaving their hometowns.
A. promised
B. were promised
C. have promised
D. have been promised
