从方框中选择恰当的句子填入对话中，使对话意思完整、正确。其中有两项是多余选项。
A: Hi, Ann. What are you going to do this weekend?
B:____
A: A concert? Who will sing at the concert?
B: Song Zuying.____
A: Certainly, I'd like to. She is my favorite singer.____
B: One hundred and eighty yuan.
A: Oh, it's too expensive.____
B: We plan to sell flowers for the money.
A: That's a good idea.____
B: No problem.
A. Would you like to go with me?
B. How much is the ticket? C .When will the concert begin? D. I decide to go to a concert with my friend. E. Can I join you? F. I don't think so. G. I'm afraid I can't go. I don't have so much money.
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2Z(g)；ΔH＜0。下图表示该反应的速率（v）随时间（t）变化的关系，t2、t3、t5时刻外界条件有所改变，但都没有改变各物质的初始加入量。下列说法中正确的是