肱二头肌在使前臂做旋后运动时，常伴有肱三头肌收缩。此时，肱三头肌被称之为

A．主动肌

B．拮抗肌

C．协同肌

D．固定肌

E．伸肌

Everyone, including my parents, ____ going to be at the party.

A．is

B．are

C．were

D．will