33. What does the passage mainly discuss?
(A) The increased use of private mail services
(B) The development of a government postal system
(C) A comparison of urban and rural postal services
(D) The history of postage stamps.
34. The word "varied" in line 2 could best be replaced by
(A) increased
(B) differed
(C) returned
(D) started
35. Which of the following was seen as a disadvantage of the postage stamp?
(A) It had to be purchased by the sender in advance.
(B) It increased the cost of mail delivery.
(C) It was difficult to affix to letters.
(D) It was easy to counterfeit.
?6. Why does the author mention the city of Philadelphia in line 9?
(A) It was the site of the first post office in the United States.
(B) Its postal service was inadequate for its population.
(C) It was the largest city in the United States in 1847.
(D) It was commemorated by the first United States postage stamp.