胃肠癌病人可出现（）
A．血酸性磷酸酶升高
B．血碱性磷酸酶升高
C．血CEA升高
D．血AFP升高
E．血VCA-IgA抗体升高
参考答案：E
As is recorded in history, silkworms (蚕) were first raised by a woman in _____ is today Hebei Province.
A．where
B．the place
C．which
D．what
双端固定桥固位不良的原因有（）
A.两端基牙牙周膜面积不同
B.两端基牙数目不同
C.基牙轴面聚合度过小
D.桥体强度不足
E.两端固位体的固位力相差悬殊
