题目

袖子为芸香科柑橘属植物，果肉浓甜，果皮肥厚，人们不仅可以用果肉制备果酒，还可以从抽皮中提取果胶。请回答以下问题： （1） 果酒制作的菌种是酵母菌，在分离和纯化酵母菌时对培养基要采用灭菌，在用液体培养基扩大培养酵母菌时，需要不断振荡和搅拌，其目的是。 （2） 制备袖子果酒时，先要对袖子榨汁并调整甜度，然后将调整好糖度的袖子果汁放90℃恒温水浴锅内，其目的是。若获得的发酵液中酒精浓度较低，而酵母菌的数阅读对话，从每题ABCD四个选项中，选出一个最佳答案完成对话 A: Hi! Can I speak to Vince? B: 1_______. Who is that? A: This is Andy speaking. Vince, can you play tennis with me? B: 2_______ A: Today. B: 3_______. I have to go to the doctor and study for a test today. A: 4__________ B: Sorry, tomorrow I am playing soccer and I have a piano lesson. A: Oh, well. 5________? B: I have to babysit my sister. A: Oh, I see. B: I am sorry, Andy. I am really busy this week. 1. A．I am Vince?                            B．Who are you? C．This is Vince speaking           D．Nice to meet you 2. A．What?               B．Where?                C．How?                  D．When? 3. A．Sure, I can    B．Sorry, I can’t          C．Yes, I’d love to    D．Of course, I will 4. A．What about this afternoon?             B．How about tomorrow?   C．Why not play baseball?                       D．Let’s play soccer 5. A．What are you doing the day after tomorrow?   B．What did you do the day before yesterday?   C．What have you done already?   D．What do you often do on weekends?