下列腧穴操作方法正确的是

A．大椎向上斜刺0.5～1寸

B．风府向上斜刺0.5～1寸

C．人中向上斜刺0.3～0.5寸

D．百会平刺0.5～0.8寸

E．长强紧靠尾骨前面斜刺0.8～1寸

The idea for the new machine came to Mr. Baker ______ to his invention recently.

A．while devoting

B．while devoted

C．while he was devoted

D．while devoting himself.