信石的性状特征有
A．不规则的块状
B．色与红色彩晕
C．极毒，不能口尝
D．砸碎后断面显层叠状
参考答案：A,B,C,E
-- Hi, Samantha! When did you arrive in Leeds?
--- Last week, I ___________ a different culture since then.
A．was experiencing
B．will be experiencing
C．have been experiencing
D．had been experiencing
车站对进出站人员检票时，对持（）和各种乘车证的旅客须核对相应的证件。
A.半价票
B.定期票
C.团体票
D.儿童票
