BEC阅读多选题

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下面是一道多选题，我选的是D，答案是B，大家帮忙看看哈:loveliness:
you can negotiate virtually anything. Projects, resouces, expectations and deadlins are all outcomes of negotiation. some people negotiate deals for a living. Dr Herb Cohrn is one of these professional talkers, called in by companies to negotiate on their behalf . He approaches the art of negotiation as a game because, as he is usually negotiating for somebody else, he says this helps him drain the emotional content from his conversation. He is working in a competitive field and needs to avoid being too adversarial. Whether he succeeds or not, it is important to him to make a good impression so that people will recommend him.

15,Dr Cohen treats negotiation as a game in order to____.
A ,put people at ease.
B, remain detached.
C,be competitive.
D,impress rivals.