原发性醛固酮增多症绝大多数是由下列哪项肾上腺病变所引起（）
A.皮质腺瘤
B.嗜铬细胞瘤
C.转移癌
D.肾上腺增生
E.皮质腺癌
参考答案：A
---What _________ to the building? ---It _________ when all the people were sleeping.
A．has happened; was broken in
B．was happening; was broken down
C．was happened; broke into
D．happened; was broken into
我国集中式给水出厂水管网末梢含余氯量应控制在（）
A.≥0.05mg/L
B.>0.05mg/L
C.≤0.05mg/L
D.=0.05mg/L
E.≥0.5mg/L
