答案:15 B 16D 17A 18D 19B 20 A

15.第一段有这样一句话needs to avoid being too adversarial，也就是说要保持客观，公正，超然，所以选择B。
16.从第二度最后一句话可以看出，Top management may well reject the idea initially because it is the safer option but they would not be there if they were not interested.应该选择D。
17.第三段，Dr Cohen says that one of his strategies is to dress down so that the other side can relate to you. Pitch your look to suit your customer.所以选择A。
18.You do not need to become their best friends but being too clever will alienate them. you should repeat back to them what they have said to show you take them seriously.所以选择D。
19.从第四段的这句话可以看出，More common is a corporate culture clash between companies, which can put paid to any deal.选择B。
20.最后一段讲了孩子怎样通过各种途径达到自己追求的目标。所以选择A。