Question number 39-42 based on the passage below.

    A distinctively American architecture began with Frank Lloyd Wright, who had taken to heart the ____ (1) that form should follow function and who thought of buildings not as separate architectural entities but as parts of an organic whole that included the land, the community, and the society. In a very real way the houses of colonial New England and some of the southern plantations ____ (2), but Wright was the first architect to make functionalism the authoritative principle for public as well as for domestic buildings. As early as 1906 he built the Unity Temple in Oak Park, Illinois, the first of those churches that did so much to revolutionize ecclesiastical architecture in the United States ____ (3) he turned his genius to such miscellaneous structures as houses, schools, office buildings, and factories, among them the famous Larkin Building in Buffalo, New York, and the Johnson Wax Company building in Racine, Wisconsin.

The word "distinctively" in the first sentence of the passage is closest meaning to which of the following?