司线员呼叫后眼睛看着主裁，手势保持到主裁宣布分或者（）认可，可放下。
参考答案：点头
具有激素性质的维生素是______。
A．维生素B1
B．维生素B2
C．维生素D
D．维生素PP
33. The child looked_________ at his brother who was badly wounded.
A．sad
B．worry
C．sadness
D．Sadly
