—Can you help me with this problem?

—It's beyond my __________.I didn't work it out, either.

A．strength

B．ability

C．energy

D．force

消化性溃疡发生的决定因素是

A．胃蛋白酶

B．胆盐

C．乙醇

D．胃酸

E．非甾体类药物