请根据下图回答：
（1）在物质分类中空气属于_________。（填“纯净物”或“混合物”）
（2）用化学符号填空：
①能供给人类呼吸的是_________；
②制造化肥并还可以做保护气的是________；
③夏天，盛放冰水的杯子外壁上附有一层水珠， 说明空气中有_________。
（3）2007年6月9日，“八国集团首脑会议”一致同意减少温室气体的排放。“温室气体”是指________，造成温室气体增多的主要原因___________。为了减缓温室效应，你认为可以怎么做？___________。
（1）混合物
（2）O2； N2； H2O
（3）CO2； 含碳燃料的燃烧；植树造林等（只要能与降低二氧化碳相关的可行措施均可）
| 短文填空：选择恰当的单词填空，每词限用一次。（有两个多余的选项） | |
restaurants play music. You might even hear music in an office 1_______ on a farm. Scientists believe that music influences the way people 2_______. According to some scientists, the sound of western classical music (Mozart and Bach) makes people 3_______. richer. When a restaurant plays classical music, people spend more money on food and drinks .When the restaurant plays 4_______ music, people spend less money .With no background music, people spend 5_______ less. Scientists also believe that loud, fast music makes people eat faster. People actually chew 6_______ food faster when the music gets faster .Some restaurants play fast music during their busy 7_______.This gets people to eat faster and leave quickly .Restaurants can make more money this way. Some scientists think that makes you think and learn better. They say that music helps students to be more alert. It is true that people learn better 8_______ they are relaxed. And listening to music can help you relax. The next time you hear music somewhere, be careful. It might change the way you behave. |