盗版软件,只是省略了注册的相关费用,因而便宜。对消费者来说没什么,尽管放心使用。
参考答案:错
下列各组物质中,前者属于混合物、后者属于单质的是
A.蒸馏水氮气
B.糖水氧气
C.氯化钠溶液空气
D.二氧化碳氢气
I didn't know you wanted to go to yesterday's concert. I _____ you a ticket.[ ]
A. could have got
B. could get
C. might get
D. may have got