51.When the doctors told Sang Lan that she would never again be a gymnast, she _______ overcome her disappointment and be proud of the things she had accomplished.

 A. would                         B. could                       C. was able to        D. should

52.The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as ________ of a great number of services.

 A. the one                        B. those                        C. ones                  D. that