--- Learning a language isn’t easy. It takes time.

--- I agree. ______. There’s no short cut.

A．All roads lead to Rome

B．Rome wasn’t built in a day

C．Practice makes perfect

D．Slow but sure wins the race

正常情况下胃黏膜不会被胃液消化的原因（）

A.胃液中可溶性黏液对胃黏膜的保护

B.胃液中不含可消化胃黏膜的酶

C.胃黏液-碳酸氢盐屏障的作用

D.促胃液素对胃黏膜的保护作用

E.胃液中的盐酸减弱胃蛋白酶的活性