糖类俗称“碳水化合物”，组成糖类的化学元素有[ ]

A．C、H、O、N

B．C、H、O

C．H、O、N、P

D．C、H、O、S

Bruce, ______ headmaster of our school, was elected by voting and other leaders were chosen in

______ same way.[ ]

A. /; the

B. the; the

C. /; a

D. a; the