鼻出血的原因大致可分为（）因素和（）因素两类。
参考答案：局部；全身
原发性醛固酮增多症首选治疗药物是（）。
A.美托洛尔
B.硝苯地平
C.硝酸甘油
D.特拉唑嗪
E.安体舒通
29. It is known to us that doing eye exercises ________ our eyes, and that is to say, our eyes can ________ doing eye exercises.
A．benefits; benefit from
B．benefits to; benefit
C．benefits from; benefit
D．benefits; be benfited from
