In the past people suffered (61) .................... a disease called scurvy. Their gums bled, their skin became rough, their wounds did not (62) .................. and their muscles wasted away. The (63) ................... of these symptoms was a lack of vitamin C; people ate preserved meats and foods and could not get fresh vegetables and fruits.

          The best (64) ................... of vitamin C are oranges, lemons, grapefruit, cantaloupes, strawberries, and fresh vegetables. These fruits must be fresh because vitamin C is destroyed by heat, storage, or exposure (65) .............. air.

          Although today more people (66) ................... vitamin C pills than any other supplement, some people still have scurvy, (67) .................. some of the elderly, alcoholics, and the chronically ill.

          Research shows that vitamin C reduces the (68) ................... of colds and can help prevent cancer. There is also evidence that vitamin C prevents heart disease, (69) ................... wound healing, helps prevent gum disease, and helps protect us from pollutants such as cigarette smoke. Some recent research also shows that vitamin C has a positive effect on some mental (70) ................. and increases life span.

1. 61. from                B. with                 C. by                    D. at
2. 62. close                B. recover             C. heal                  D. get well
3. 63. reason              B. cause                C. origin               D. signs
4. 64. store                B. resources                   C. provider           D. sources
5. 65. to                     B. towards           C. in                     D. by
6. 66. consume          B. drink                C. take                  D. have
7. 67. containing B. including                   C. consisting         D. like
8. 68. severity B. seriousness      C. gravity             D. importance
9. 69. hastens B. hurries up        C. quickens          D. speeds
10. 70. chaos B. confusions       C. disorders      D. disturbances