--- 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