下列哪项非维生素D缺乏性佝偻病的病因（）

A.日光照射不足

B.母乳喂养者未予补钙

C.生长过快

D.慢性呼吸道感染

E.维生素D摄入不足

I can ________  swim _______ skate. Will you please teach me?

A．either…or

B．not only… but also

C．both… and

D．neither… nor