初级排便反射中枢位于（）
A.大脑皮质
B.下丘脑
C.延髓
D.脊髓胸腰部
E.脊髓腰骶部
参考答案：E
—What does your sister do ?
— . [ ]
A. She is in the supermarket.
B. She is very tall.
C. She is a teacher.
D. She is fine.
关于骨骼的说法错误的是（）。
A.上肢骨有32×2块
B.下肢骨有31×2块
C.全身骨共有208块
D.颅骨共有29块
