反刍动物的复胃中不分泌胃液的是()
A.瘤胃
B.网胃
C.瓣胃
D.皱胃
参考答案:A, B, C
--- How is he getting on with his spoken English?
--- Great. Now he can speak English ______ his English teacher.
A.as better as
B.as well as
C.as good as
D.as many as
氟骨症病人血钙降低是由于
A.氟引起肾脏重吸收降低
B.血中氟与钙结合沉积于骨组织
C.氟促进血中钙形成盐类而排出体外
D.氟干扰钙的吸收
E.氟促进降钙素的分泌