食管癌好发部位,是
A.颈部食管
B.胸部食管上段
C.胸部食管中段
D.胸部食管下段
E.腹部食管
参考答案:C
在急性胰腺炎发病过程中起关键作用的酶是()
A.淀粉酶
B.弹力纤维酶
C.胰蛋白酶
D.磷脂酶A
E.激肽酶
How much is this blue tablecloth?()
A.The green one is better.
B.Ten dollars and thirty cents.
C.It's cheap.
D.Yes. It's beautiful.