Look! There is _____ colour bird in the tree. ______ bird is singing.

A．a; The

B．/; The

C．the; A

D．a; /

颅底骨折的诊断主要依据

A．头颅X线摄片
B．放射性核素脑扫描
C．颅脑超声波探测
D．临床表现分析