一 ?
— I'm looking for a hat for myself.
A：What are you doing
B：What can I do for you
C：What did you say
为测定一瓶失去标签的过氧化氢溶液的溶质质量分数，某同学取50.0g过氧化氢溶液放入烧杯中，然后加入2.0g二氧化锰，等不再放出气体，称得烧杯中剩余物质的总质量为50.4g．计算：
按拼音写汉字。
lún kuò
hén jì
shì hé
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Even the extreme climate can't prevent polar bears wander on the beach.
