He thought this was the first pair of shoes that had fitted him ________.

A．perfectly

B．justly

C．fairly

D．rightly

某运动员常出现面色有些苍白、头昏眼花、注意力不集中等症状，可能的病因是（）

A.维生素B₁缺乏

B.铁缺乏

C.蛋白质缺乏

D.锌缺乏

E.运动量过大