In formal occasions, you greet people like this
A.Hi, buddy, what’s going on?
B.Good morning. My name is Xiao Jingteng. This is my business card.
C.Sounds great! Let’s have dinner together.
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In informal situations, you greet people like this
A.Haven’t seen you for ages! How are things going?
B.How do you do?
C.Nice to meet you, my name is Lucy Green.
When you meet a stranger for the first time, what will you say?
A. What’s your name?
B. Are you from England?
C. How do you do?
When you haven’t seen somebody for a long time, what will you say?
A.How do you do?
B.Long time no see.
C.You can call me Joanna
燃素理论面对的困难是解释不了燃烧过程中的（）现象。
A. 升温
B. 增重
C. 减重
D. 散热
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