I hate to do the dishes because it's very _______.[ ]

A. interesting

B. boring

C. fun

D. exciting

原发性高血压的最重要的致病原因是

A．摄盐量过多
B．吸烟
C．交感神经兴奋性增强
D．肾上腺嗜铬细胞瘤
E．遗传素质