— Here's a box of chocolate on our desk. For me or for your mom?
— It's , Dad. Happy Father's Day!
A:hers
B:her
C:yours
D:you
盛夏天气炎热,小佳将奶茶喝掉一半后盖上盖子放入冰箱,一段时间后,她拿出奶茶瓶,发现奶茶全结成冰,请问奶茶结冰后不变的量是( )