煤粉在炉内的燃烧过程大致经历三个阶段，即着火前的（）、燃烧阶段和燃尽阶段阶段。
参考答案：准备阶段
简述解冻时汁液流失的影响因素？
补全对话，每空一词。
A: Hi,Lucy. What 1 your mother do?
B: She's a nurse.
A: Do you want to 2 a nurse, too?
B: 3 , I like singing and dancing. I want to be a musician.
A: What 4 your father?
B: He is a teacher.
A: 5 does he work?
B: He works in No.1 Middle School.
1. ___ 2. ___ 3. ___ 4. ___ 5. ___
