关于脊柱结核正确描述的是
A．主要累及棘突
B．可有拾物试验阳性
C．可有托马斯征阳性
D．手术治疗无须抗痨药物配合
E．早期易形成寒性脓肿
参考答案：B
--- You were out when I went to visit you yesterday.
---Oh, I________ for a friend from England at the airport.
A．was waiting
B．had waited
C．am waiting
D．have waited
（）作业是脱水作业的第一步。
A．浓缩
B．过滤
C．干燥
