阅读下列短文，然后根据要求回答：
①酸类中有一种醋酸，化学名称是乙酸，它是食醋的主要成分。
②在16.6 ℃以上纯净的乙酸是一种有强烈刺激性气味的无色液体，易溶于水和酒精。
③醋酸化学式中CH3COO-为醋酸根离子（负一价原子团）
④醋酸和硫酸、盐酸一样，能与活泼金属（如Al 、Zn 、Fe 等）发生置换反应产生氢气，所以家用的铝制器皿不宜用来盛放醋，以免被腐蚀。
⑴上文中提到醋酸的物理性质是：（填序号） 。
⑵在食醋中滴入少量紫色的石蕊试液，则溶液呈 色；
⑶醋酸在氧气中燃烧的产物是二氧化碳和水，请写出醋酸在氧气中燃烧的化学方程式： 。
⑷醋酸和锌的化学反应方程式为： 。
⑸用铝制器皿盛放食醋，还有什么缺点？ .
⑴②
⑵红
⑶CH3COOH+2O2
2CO2+2H2O
⑷Zn+2CH3COOH=(CH3COO)2Zn+H2↑
⑸会使食醋中含有Al3+，食用后影响人体健康。
| 完形填空。 |
| Dear Charlie, I have just come back from my vacation. This summer I 1 at home. Instead, I 2 back to my home village near Harbin to see my grandparents. They 3 me that their life had changed a lot since 1984. In 1989, they 4 a truck to help sell milk and their cows to town. My uncles 5 them to catch fish in a lake not far from their house. They 6 a happy life now. Next week the new term 7 and I 8 busy again. Best wishes, Xiao Jun |
| ( )1.A.stay ( )2.A.go ( )3.A.tell ( )4.A.buy ( )5.A.help ( )6.A.live ( )7.A.begin ( )8.A.am | B.doesn't stay B.goes B.tells B.buys B.helps B.lives B.begins B.is | C.don't stay C.going C.are telling C.buying C.helping C.are living C.will begin C.are | D.didn't stay D.went D.told D.bought D.helped D.lived D.began D.will be |