38. (A) As textbooks.

　　(B) As fuel.

　　(C) As newspapers.

　　(D) As art.

　　39. (A) Taxes on factory goods rose.

　　(B) Some people lost their farms.

　　(C) Shipping prices rose.

　　(D) some families lost their businesses.

　　40. (A) Problems with pesticides.

　　(B) Characteristics of one type of falcon.

　　(C) Migratory patterns of birds.

　　(D) Tracking systems for animals.

　　41. (A) It flying speed.

　　(B) Its keen hearing.

　　(C) It size.

　　(D) Its aggressiveness.

　　42. (A) By radar.

　　(B) By airplane.

　　(C) By direct observation.

　　(D) By satellite.

　　43. (A) The types of instruments used in bebop music.

　　(B) The social setting in which bebop music developed.

　　(C) How two styles of jazz music influenced each other

　　(D) The influence of bebop music on the United States economy during the 1940's.

　　44. (A) They didn't use singers.

　　(B) They gave free concerts.

　　(C) They performed in small nightclubs.

　　(D) They shortened the length of their performances.

　　45. (A) To discuss one way it impacted jazz music.

　　(B) To explain why the government reduced some taxes.

　　(C) To describe a common theme in jazz music.

　　(D) To discuss the popularity of certain jazz bands.