家禽心血管系统的解剖结构特征()
A. 家禽肝门静脉分为左右两干,左干主要收集胃和脾的血液。右干主要收集肠的血液。
B. 红细胞有核
C. 有右侧主动脉弓
D. 以上都是
That sentence _______ is wrong.
A. himself
B. its
C. itself
D. it
Nobody taught her drawing. She learned it _______.
A. she
B. her
C. hers
D. herself
The police hid(躲藏)_______ behind the building.
A. himself
B. themselves
C. itself
D. herself