苯引起的职业肿瘤是
A．肝血管肉瘤B．肺癌C．胰腺癌D．白血病E．胸腹膜间皮瘤
参考答案：D
利用 Access 创建的数据库文件，其扩展名为______。
A．.ADP
B．.DBF
C．.FRM
D．.MDB
After _________ the luggage at the railway station, we left for the exhibition in a taxi. [ ]
A. claiming
B. demanding
C. deserving
D. obtaining
