补全对话
从方框中选择最佳选项完成对话。
a. How much is it, please?
b. Oh, yes. We have blue, yellow and white ones.
c. Which one would you like, please?
d. I'll take this one.
e. Can I help you?
A: ____
B: Yes, please. I want to buy a sweater.
A: ____What about this one?
B: I don't like black. Do you have any other colours?
A: Other colours? ____
B: Can I have a look at the yellow one?
A: Yes, please.
B: ____
A: Ninety yuan.
B: OK. ____Here's the money.
A: Thank you.
2SO3(g) ∆H=-akJ/mol（a>0），经2min达到平衡状态，反应放热0.25akJ。下列判断正确的是