WHAT IS THE MAIN PURPOSE OF THIS PASSAGE

20. What is the main purpose of this passage?A. To stress the importance of wood as a building material.B. To trace the influence of Swedish and British settlers on American styles of buildings.C. To describe a revolutionary technique for constructing wooden houses.D. To compare methods of constructing wooden houses in various parts of the country.IV. Choose the word or phrase that best fits the blank space in the following passage. People in the United States often shop from catalogs. There are special catalogs for (21)____every need,including clothing, furniture, health, (22)____products and things for the kitchen. People also order (23)_____40% of their music from music club catalogs. Customers say that music stores are too noisy.Television shopping began in 1986. About 5% to 8% of the American public now shops by television.Some (24)_____shopping channels are the Home Shopping Network and QVC. Customers say that televisionshopping is (25)____.than shopping in a store. How do they buy things? They (26)______a phone call andcharge the item to their credit card. And TV shopping channels are on late at night (27)______people can goshopping anytime.Is computer shopping the way of the future? About 37% of American (28)____now have personalcomputers. And shopping by computer (or shopping on-line) is (29)______to more people every day. Already,shoppers can use their computers to order many different products, such as computer products, flowers, foods,T-shirts, and posters. And new on- line shopping services (30)________every day. Soon people may be able toshop for anything, anytime, anywhere in the world.