Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.

Relationship: 'be base in', Argument/Subject 1: 'association', Argument/Subject 2: 'washington'
National Rural Electric Cooperative Association based in Washington , D.C.

Relationship: 'be bear in', Argument/Subject 1: 'bill lewi', Argument/Subject 2: 'maidstone'
Bill Lewis was born in Maidstone , England .

Relationship: 'be professor at', Argument/Subject 1: 'bjorn lomborg', Argument/Subject 2: 'copenhagen business school'

Dr. Bjorn Lomborg is adjunct professor at the Copenhagen Business School and author of the best-selling " The Skeptical Environmentalist " in which he challenged mainstream concerns about the environment and pointed out that we need to focus attention on the most important problems first .