题目

有甲、乙两位同学想利用下列装置及化学试剂，对实验室制取并收集氨气的实验进行改进． 化学试剂：①NH4Cl固体、②浓氨水、③固体NaOH． （1）甲同学想方便快速制取少量氨气，应选择的装置是B（填序号），选用试剂是   （填序号）．选用上述试剂制氨气的理由是   ，实验过程中，制气时的实验操作是   ． （2）乙同学建议，把教材中实验室制取氨气的收集装置由大试管改为集气瓶且瓶口向上收集氨气，并确保不污染环境，请你根据其设想回 从方框中选择恰当的词或短语并用其正确的形式填空。 rise,  come,  choose,  win the prize,  be on,  draw pictures, pay for,  struggle with,  at the beginning,  be used to 1. Time for Africa __________ as the 2010 World Cup song, hasn't it? 2. — Jack, coffee or juice?     — Juice, please. I __________ drinking it. 3. If we don't reduce carbon emission (碳排放) to stop the temperature     from                  , there will be more disasters. 4. — What a pity! The film __________ for one hour.     — It doesn't matter. We can see it next time. 5. Tony wants to know how much I ____________ this new dictionary just now. 6. Dad, I'm very nervous because of the ____________ English competition. 7. — Herta Muller is great. She was the winner of the 2009 Nobel Prize for Literature.     — Yes. She's the 12th woman ____________. 8. __________ of 2010, a 3D film, Avatar was shown all over the world. 9. People in some parts of China ___________ the serious rainstorms at present. 10. — What were the children doing over there?       — They ___________ to welcome the 41st World Earth Day.