What is the device a speaker uses at the end of a speech to ensure that the audience is left with a mental picture predetermined by the speaker? A: predominance device B: finishing device C: concluding device D: finalizing device

Questions 11 to 18 are based on the conversation you have just heard. What are the speakers doing right now（） A: Drawing up a business plan. B: Discussing a term paper. C: Finalizing a contract. D: Reviewing a co-authored article.