The limits of a person’s intelligence, generally speaking, are fixed at birth, but ________he reaches these limits will depend on his environment.

A．where

B．whether

C．that

D．why

服脊髓灰质炎三联疫苗下列哪项做法是错误的

A．每次服三型白色糖丸一粒，每次隔1个月，共3次

B．可于1、2、7岁入学前后服1次加强免疫力

C．吞服糖丸时必须用冷开水送服

D．发热、活动性肺结核、免疫缺陷者均应忌暇本疫苗

E．为了增强免疫力在口服本疫苗的同时可肌注丙种球蛋白