正确答案: A

干冰

题目：我们熟悉的这些物质属于纯净物的是

解析：A

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学习资料的答案和解析：

[单选题]在探究温度对鼠妇生活影响的实验中，实验组和对照组都应该保持相同的条件是

空气、湿度、光等

[单选题]中学生许重宁发明了“新型组合救援医用服”获得专利后，其父母代表她与某服装厂协议，每卖掉一套衣服，许重宁可获得 2—4元的提成。这表明，许重宁对自己的合法财产

享有收益权

[单选题]II．完型填空I have a twin sister，Kitty． She has (11) hair than me． I don't like long hair．Many people think we (12) have lots of things in common．l-m afraid this is not true． When my parents ’friends come to our home，Kitty often sits there and says (13) ，but I like to talk with them．So she is (14) than me． Kitty likes reading，drawing and cooking． I just like swimming and playing basketbaIl．She has (15) hobbies than me，but she is not as athletic (16) me． Be-cause Kitty does (17) than me at school，my parents often say to me，"(18) Kitty is younger than you，you should learn (19) her． We do have some similarities(相似之处)，however． For example，we (20)like eating fast food ，going shopping and listening to pop music．

longer

[单选题]22． When did Jackie Chan's parents move to Hong Kong?

They moved to Hong Kong a short time before Jackie Chan was born．

解析：22.B【解析】从第一段第二句可知．