教练员在做动作示范时应（）.
A.越快越好；
B.越慢越好；
C.动作清晰，有节奏感；
D.不快不慢
参考答案：C
Wang Gang is considering buying a computer, is considered to be a great help in our work and study.
A．as
B．which
C．that
D．what
热原质（pyrogen）
