一般情况下，导游员应在飞机抵达的预计时间前( )，到问询处询问。
A．半小时
B．一小时
C．一个半小时
D．两小时
参考答案：B
—Did you meet Tom at the airport?
—No. His plane ________ by the time I ________ there. [ ]
A. has taken off; got
B. took off; had got
C. took off; arrived
D. had taken off; arrived
具有化瘀止血、利尿功效的药物是（）
A.蒲黄
B.茜草
C.花蕊石
D.降香
E.三七
