不宜用二灰稳定土的土为：（）。
参考答案：有机质含量超过10％的土不宜选用
“Drive-ins” have large parking lots ________ customers are served in their cars by waitresses.
A．who
B．when
C．which
D．where
喉返神经来源于
A．喉上神经
B．交感神经
C．迷走神经
D．副神经
