It is difficult to ____ one twin from the other. They almost don’t ____ from each other. 

A．differ, distinguish

B．distinguish, differ

C．distinguish, different

D．tell, different

等渗性脱水治疗原则应该是

A．5%等渗盐水

B．5%葡萄糖溶液

C．等渗盐水与5%葡萄糖溶液各半

D．3%～5%高渗盐水

E．10%葡萄糖溶液