__________ Tom __________ Sam may go with you because one of them must stay at home.

A. Both; and           B. Either; or            C. Not only; but also

高血压伴有低血钾应首先考虑（）。

A.主动脉缩窄

B.原发性醛固酮增多症

C.嗜铬细胞瘤

D.继发于慢性肾炎的高血压

E.肾动脉狭窄