铬酸洗液因（），近年来多以合成洗涤剂、有机溶剂等来去除污渍。
A.毒性较大
B.配制复杂
C.代价大
D.不易保存
参考答案：A
-I left my handbag on the train, but luckily someone gave it to a railway official.
-How unbelievable to get it back! I mean, someone________ it.[ ]
A．will have stolen
B．might have stolen
C．should have stolen
D．must have stolen
用于精神忧郁，烦躁失眠的非处方药是( )。
A．脑乐静B．安神补脑液C．天王补心液D．枣仁安神颗粒E．人参珍珠口服液
