成人蛛网膜下腔终止于（）
A.第一、二腰椎
B.第三、四腰椎
C.第五腰椎至第一骶椎
D.第二交感神经节
E.以上均不是
参考答案：C
17. It’s said ______ ______ was everything _______ Mr. Professor could tell us.
A．that; what; all
B．what; that; that
C．that; that; that
D．what; that; what
自行车棚内不允许堆放杂物，地面清洁卫生，墙面无（）现象。
A.乱贴乱画
B.乱扯乱挂
C.乱摆乱放
D.乱扔垃圾
