
清洁生产推行的原则包括()。
A . 调控性、综合性B . 前曕性、动态性C . 强制性、自愿性D . 现实性、选择性


A . 调控性、综合性B . 前曕性、动态性C . 强制性、自愿性D . 现实性、选择性
Task II. Listen and fill in the blanks with the missing words and role-play the conversation with your partner.
A: What about _1____________________ out for a walk with me ?
B: Sorry, but I have to finish my homework .
A: It’s OK. Homework should come _2_____________________.
B: _3_____________________ will you finish your homework?
A: I don’t know because I have great difficulty with these electrical _4______.
B: Don’t worry! I can give you a hand.
A: Thanks! What does the letter ‘I’ stand for?
B: ‘I’ is the symbol (符号) of electric _5__________________, which means the flow of electrons.
A: What about the letter ‘R’?
B: ‘R’ stands for electrical _6___________________________, which is the opposition to the flow of electrons.
A: What are conductors?
B: Materials that electricity can easily pass through are conductors while things that electricity can not easily pass through are insulators or _7___________.
A: I’ve got it. Thank you so much for your help.
B: It’s my pleasure.