下列不属于头部附肢的是（）。
A.第一触角
B.第二触角
C.第三触角
D.第一小颚
参考答案：C
—Are they about to have dinner？
—Yes, it ________ in the dinning room.
A．is serving
B．is served
C．is being served
D．serve
变压器绝缘电阻规定？
