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.
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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
17世纪末，欧洲开始流传一种燃烧本质的学说“燃素说”，但后来证实，这种学说中的燃素是一种不存在的物质。
A. 对
B. 错
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