Questions 61 to 65 are based on the following passage:
In the year following the Civil War, businesses began to form monopolies（壟斷）. A monopoly is a business or corporation that has exclusive control over a certain market. This means that a monopoly has no competitorsIn business, competition among businesses tends to keep the prices of products down. Since they had no competitors, monopolies, depending on how essential their product was, could charge as much as they wanted for their product.As more and more monopolies began to appear, some Americans began to wonder how these big companies could so easily drive their competitors out of business. One person who was especially interested in the practices of these monopolies was a journalist named Ida Tarbell.During the early 1900's, Ida Tarbell's articles took on such big corporations as the Standard Oil Trust Company. She described the methods that these monopolies would use to drive rival companies out of business. For example, she described how big companies would make deals with railroad companies. (According to the terms of these deals, the railroad companies would charge the big companies lower rates to transport goods.) Smaller companies who competed with the big companies would be charged the regular rate, which was much higher.

61. What is the passage mainly concerned with?
A. The definition of monopolies. B. The success of monopolies.
C. The reasons for the success of monopolies. D. Both B. and C.
62. A monopoly is a business that controls the market, ________.
A. beating all other competitors B.including only a few competitors
C.excluding many rivals D. none of the above
63. 63. If a monopoly wants to change as much as possible, __________.
A. it must have competitors B.it must be a big business
C. its products must be indispensable to people D.its products must be of high quality
64. 64. Tarbell's articles are mainly concerned with _________.
A.the competitive power of big companies B.the competitive methods by big companies
C.the dirty deals between big and small companies D.the dirty deals between big companies and railroad companies
65. The word "terms" in Paragraph 4 means ____________.
A.conditions B. semesters C. periods of time D. money